i'm still running mine.
i will tell you my early results are that these are not quite lasting as long as the stock battery. my battery meter still doesn't seem to quite sync up with the battery level meter. even things like i get the 5% battery remaining warning - but then the phone immediately shuts off.
i'm finishing out this week and then probably switching back to the stock battery.
the stock battery i'd get 1 day 8 hours with about 4 hours screen time (screen set to auto brightness). i can get decent idle time with this ace battery - but only about 3 hours of screen use. couple that with the issues i posted in the paragraph above, i'm ranking the performance of this battery just below how the stock battery was performs. maybe ok if you need a replacement battery (because of the cost) but it does not appear to give any longer phone life.
---------- Post added at 10:25 AM ---------- Previous post was at 10:23 AM ----------
ps - andy has some nice battery life running the viper rom (andy - what screen brightness are you using?). another reason i can't wait for root... i was happy with the stock battery life of this phone, but any extra battery life will always be a plus!