Well, here is an update. I played a local ladder match with the TFight 300RS yesterday. My opponent was a lefty with a good serve and precise groundstrokes. I couldn't really dial in on my returns and lost badly. I felt like the racquet did very well in defensive situations (I could hit defensive shots, and sometimes even defensive winners, with a very short swing). However, I didn't quite like it on the returns. Maybe it's me and not the racquet, but the feel just wasn't there. I switched to the TF40 305 after the end on the "official" match and played a couple more games with it, and l felt like I was able to return with it better.
Played another match against my usual opponent with the TF40 305 today. Was tired after playing yesterday and lost 3-6, but I really enjoyed the TF40/ While it doesn't have the easy power and spin that the 300 RS has, when I do everything properly, it certainly crushes balls. I just need to be disciplined and use my legs and body, not just my hands. I actually missed quite a few balls long because I wasn't patient/disciplined enough: wanted to go for easy winners and make the ball dip with a wrist motion, but this is not how the TF40 is supposed to work.
Anyway, I need to send my demos back tomorrow. If I were to choose between the TFight 300 RS and the TF40 305, the TF40 has eventually won me over. While it's a bit more demanding, I like its feel more, I like returning with it more, and I feel like it would be really rewarding if I do everything right.
Will I buy it? Well, perhaps not so fast. I am still undecided between the TF40 and the Radical MP. I've tried several other racquets and liked them less, but these two are very close. However, I tried the Radical about 5 months ago and didn't get to play any matches with it, so it's difficult to make fair comparisons. I'll probably demo the Radical MP once again, alongside the Pure Strike 16x19, the Pure Aero VS, and either the Speed MP or the VCORE 98 (if TW allows me to demo 4 racquets at once). And then I'll choose between the TF40 and the Radical MP... or one of the other three racquets, if I like them more.