I think it is... I'm running 900mhz 500dsp lehto kernel and the phone runs great. especially the browser with scrolling big pages. and emu/roms work way better. picodrive has no skip or slowdowns in my limited experimenting.

Battery life is good on days I dont use the phone much...maybe better than stock, but heavy usage drains it maybe 20% quicker than stock at a guess?

flashed without using usb with fiasco-flasher. kept all my version info as standard so no need to restore version info or be worried how to auto-update to pr1.2 like some posters.