Have gained me the stick as a replacement for an old HUAWEI E173 and am thrilled. The download / upload speeds have more than doubled. With an external antenna are even some kbit / s indoors more.
The stick works perfectly with Win XP & 7 and Linux Mint. Have infected him on my TP-Link 3220 3G / WAN wireless router and the thing also works (latest router firmware required -> TP-Link page). My Provider: A1 & Three (Austria).