As I stated before, I downloaded this a few days ago to check it out. I figured that I would report back now.
I didn't experience any problems at all. No errors, no glitches, no freezing, FCs, anything. However, I also didn't see any improvement at all. Prior to this I had SetCPU running, which i removed for this program.
my battery definitely did MUCH worse on this compared to how it ran on SetCPU. Not really sure why, but I could never get it to make any difference.
I used to also run Juice Defender which worked GREAT! My battery life would substantially increase with Juice Defender. However, the problem I had with that was sometimes, when turning on the screen and waking it up, I would have problems reconnecting to wifi or 3G. My network just plain wouldn't re-establish connection when waking up. So eventually i removed it.