Joser, have you ever tried CPU Boost? I hear it works just as great and it's also free.
Just wanted to throw in another one.
That is what I use(CPU BOOST),for the following reasons:
1) Auto start on boot option
2) Dual screen-on/screen-off settings
3) Ease of use
Granted,you can't precision tune a precise setting,as you perhaps can with other CPU apps,but you still have choices(6 or 7 I believe,far better than when this app first came out {2}),but it's probably one of the better FREE CPU APPS currently on the market.
P.S. I currently do not use any battery saving apps or task managers,more of the "too many generals,not enough soldiers" theory.
I believe they could be used sparingly,but, they are at best,a supplement,but definitely not a "cure all". It seems they interfere with background running apps,you have to leave some of them running,or you will begin to experience performance issues,namely,SMS,MMS,E-MAIL,&PHONE CALLS.That seems to be the bulk of most performance issues,but not all issues,experienced,especially if you stop & think back exactly when you start experiencing problems.
Perhaps,keeping a log of mods(apps or setting changes) & problems you experience may help.
(I need to practice what I preach here & help myself for a change,LOL).