I've got it on mine and it hasn't crashed. I will note however, that if you go too low for the Max speed, this phone will come to a crawl. I had mine set at 400/200 for battery <20%, and it had trouble coming out of the lock screen. Did some tweaking but my batter is almost dead anyways, so I will have to comment on it tomorrow.
I'm debating if I want to get JuiceDefender or not. It's a good program, but the "turn off data" for 15 mins is what's getting me. I text and Google Talk alot, so I may just download the program and use it while I'm at work, then disable it when I get home.