I'm using it in my 7" tablet that only supports 3G data connection. The download speed was between 1.X and 6.X Mbps (depends on location). The network (using 3HK 3G) is stable. It's good enough for general web browsing, email check and online chat tool. Of course there are limitations (refer to http://www.eprice.com.hk/mobile/talk/3146/204279/1/).
My favorite data plan is $28 for 1GB (30 days)
ps. Gave up the Network III 4G (previously used; $48 for 1GB, $78 for 2GB, etc) coz there is no point putting a 4G sim in a tablet that supports 3G only!