as someone who just got a DCS-930L, i can tell you the wifi range isn't that great. unless it's within 20ft or so of the router, it will not be able to maintain a stable connection. but when the wifi connection is stable, pic quality is good enough with a max frame of 20fps at 640x480. some competing IP cams have 640x480 resolution, but only 15fps max.
the 930L doesn't have night vision, and framerate will drop as light decreases. there is a crackling/popping/static noises in the audio, so i just disabled the audio in the settings as i don't really need it. this seems to be a common problem on the 932L as well.
these are just my first impressions. i'll have to use it for a few weeks before i can comment on durability.