I really can't comment on the disconnections as I haven't used for more than2 hours at a stretch, it isn't my main connection. Speed will depend on signal strength in most cases. Getting good signal strength is essential, check the signal before switching full time to3g. At my place speed averages at 2.5mbps at about-71dBm. The tower is in front of my apartment, 300mts or so, so I haven't noticed significant differences even in heavy rains. I Best way is to try it for yourself for a few days and then switch over if you like it.