The vibration is pretty good, I can feel it through my big handbag haha.. And it doesnt vibrate the way an SE phone does (i just switched to nokia again after two SE phones)

As for ringing alarm, not sure. Cos only had the opportunity to use once hehe. But if you're like me, put the phone under ur pillow, the ringing alarm + vibration will definitely wake u up.

wah.... erm... but i have this need to sleep with my phone beside me/very near me haha.. put *beside* the pillow can ah but damn, i dont want my brain cells to die!!!