I have a P90TR, and I find it great. I used to use an UMP, but I stopped after trying the P90 (I dont remember why, I guess the P90 just felt better for me...). But today I just got an UMP to try it out again, and I found that im good with it... So now I use both. I use my P90TR until it runs out of ammo, then switch to UMP. and when that runs out ill be using my pistol (though I never usually run out... sometimes on Deathroom I do, but thats still rare...)
Im goin with P90 though. And I dont see how its noobish.