I haven't had any problems. Keep in mind I haven't tried any of the other VoIP clients for Android -- Skype, Nimbuzz, etc. Only sipdroid. But I've used it over plain EDGE/GPRS on my Android dev phone (G1) and had no quality issues to speak of, other than the occasional dropped call, which can happen on normal GSM anyway.<p>As far as I know, the 'official' Skype client for Android is still 'Skype Lite' or something, which costs you minutes on your cell phone plan to use, and might connect over GSM as well (I'm not sure). It wouldn't surprise me if this craptacular idea tarnishes people's perception of VoIP on Android.