Ok, I've played 4 hours with the Koji blade now. I will compared it to the Defplay senso and OSP Immune for my perspective on how these 3 blades play.
Now in retrospect I have put the wrong rubber on the Koji, I used a sheet of DHS Skyline 3 (TG3). This turned out to be totally the wrong kind of rubber for the Koji, I wasn't expecting it to be so bad but I'll explain. On the Defplay I had the usual Haifu Whale soft (red sponge) on the forehand and .5mm 388D-1 on backhand. On the Koji I had TG3 neo (39 degree) and Dr Evil 1.0mm. I've been playing Dr Evil OX on the Defplay for about the last month. And the TG3 is my normal forehand rubber when using inverted and the rubber I use on the OSP Immune.. I've been using TG3 for a couple of years so I know very well how it plays.
Ok first the Koji, firstly the handle is much wider than I'm used to in a defence blade but it's ok. I have thin hands with a ton of space inside my grip so normally I like big handles but I find in defensive blades I like thinner handles.. Go figure. So the handle, it's OK but I prefer the handle on the Defplay and the Square straight on the Immune use to be my favourite handle of all time but again, these days I prefer the rounder handle on the ST Defplay.
Now the first thing I noticed when hitting a ball with the Koji was the very large amount of dwell coming from deep in the blade, it holds the ball very well and it chops notably lower then either the Defplay or the Immune. However it loops BADLY (with TG3). Straight away I was like oh man... wrong rubber for this blade, it's very mushy, has not much feeling and not much flex either, kind of feels dead or muted compared to the Defplay and the Immune which are both very elastic blades and both have good feedback, the Defplay doesn't vibrate much, just a normal amount, the Immune vibrates HEAPS, the Koji you can't really feel much at all. High feedback, high flex blades are what I normally play with to enhance my forehand loop. Overall the Koji is not a loopers blade in anyway, I did find a way to make the Koji behave on the forehand later in the day, I'll talk about that later.
Now the Defplay, this is more flexible, far far more powerful, more accurate and just better on the forehand, overall it's faster not much and mostly from the extra kick you get out of the flex but it is faster. It most definitely doesn't chop as well as the Koji because it doesn't have the same stay on the blade that the Koji has, however it's that exact same feeling that makes the Koji not so great on the forehand. The Koji has a very low throw when hitting forehands and not consistent again because you don't get the flex. I find chopping with the Defplay has a extra degree of difficulty but on the other hand they are _sometimes_ awesome. One thing to note is that I play with long pips very aggressively, actually I don't think most people would realise I was playing with a long pips if they watched me play with 388D-1, I play with them just like inverted most of the time with a topspin game on the backhand with a flatter variation to draw the net ball, I find that very easy, much easier than chopping. Until I can get far away from the table then I can chop with them. The Defplay because of it's flex makes top spinning long pips very easy. On the flip side of the coin you get basically zero reversal and dodgy effects from 388D-1 on the Defplay.
The OSP Immune, again it's a good looping blade, it loves hard rubber but I bet it works fine on soft rubbers too. It's a hard blade, harder than the Defplay or Koji. Chops heavier than the defplay on the forehand but harder to use on the backhand. It loops almost as well as the Defplay. It's a good blade but because it's so much heavier than the Defplay (it's 95 grams so about the same as the Koji in weight) (My Koji weighs 93 grams) and because the Immune doesn't really do any thing better I've been preferring the Defplay these days.
This is all from the perspective of playing a modern defender style with the main part of the game setting up the forehand attack. The Defplay for this style of game is pretty much a 10/10 where the Koji with hard Chinese rubber is one of the worst forehand looping blades I've used so even though it does chop well I'd only give it a 5/10 as a modern defence blade. However IF (when) I were to try a soft rubber on the Koji, a tensor, tenergy fx etc.. Something with some springy sponge where I don't have to use the blade and not being dependant on the blade being powerful then I think I'd rate the Koji much better and I will try that kind of rubber on it to see if it can loop well then. Now about the adjustments I made to make the Koji loop.. Later in the day I tried a very wristy Brian Berry style loop, that used basically no blade and really hammered the sponge and then the Koji looped quite wickedly well, had good spin and very good speed, but that's quite the opposite to the way I naturally loop which is a very heavy impact in the blade and the Koji just is not loop happy for that style.
Now If I were more defender rather than looper or modern defender and I was chopping from both sides MOST of the time and had a soft thin sponged rubber on the Koji, then I believe I'd rate the Koji a 10 and the Defplay an 8. I'd rate it higher than the Defplay because it chops better and if the world didn't revolve around your loop. Well then chopping becomes important
. I could see using long pips on the Koji with a thin sponge and a soft forehand also in a thin sponge. I can see that working very well and that's totally the opposite of what I was using today so to be fair to the blade I will revisit it next week with that setup. The blade was just telling me, that's the kind of rubbers it wants, it was fairly obvious when using it.
The Defplay is quite happy with the hard tacky rubbers and the short pips so it's another kind of beast altogether. I've used both hard and soft rubber on the Defplay and it's a looping monster either way, right from the first time I used it I declared it the most spinny blade I've ever looped with and it still is. The Immune is not far away at all, the Immune is more spinny than the similar OSP Expert and that itself is a very spinny blade but not as much as the Defplay.
Anyway, that's where I'm up to so far. I think the Koji has potential when I have the right rubbers for it but the Defplay suits my natural game and existing rubber preference much better. The Immune... It's lovely but it doesn't really do anything amazingly well. Doesn't chop as well as the Koji or loop as well as the Defplay. I'll post back here once I find myself a soft rubber to try on the Koji to see if I can make it behave on my forehand.