I use ATK and have no problems at all NONE, just don't end everything just make sure your only ending games and other apps you don't want open all the time I use it mostly for gmail as when using Market it reseeds all the gmail crap and sync when I have sync its self disabled it does this on any app that needs a gmail login I guess its just one of them functions they felt would make the lifes easyer and it does but after that I want it gone when I am done with my task, I leave things like Clock and Messages always running tho as the Message app does tack a wee longer to run if it was ended lol.
My Huawei U8180 (TMobile Rapport) soon to be cm7 Mod by subpsyke
My HTC Wildfire Stock - 2.2
My HTC Desire MIUI 1.12.2
My HTC Desire GingerVillain 2.4 - 2.3.4 - No GSM/Radio function thanks to hardware fault.