I've been at 1GHz for about a week now running Ultimate Droid 7.8 w/ setCPU, and it's been absolutely perfect. A whole different beast now. I havn't even noticed my phone getting any warmer than it did stock. with average usage, the temp hasn't gone above 90 yet, and that was with Pandora playing while using the nav in the car dock. I havn't noticed a significant drop in battery life either, but i have the phone drop 250MHz on sleep/standby. Also I have it set to 550MHz on charging so it doesn't get hot while charging either. I've had no FC's or random reboots either.