This is somewhat obsolete as device is just 2 year old, but just got Samsung Galaxy 2 10.1 for testing.
Still looks nice, but is in desperate need to update OS to the latest (from 4.1.1). Samsung now offers 4.2.2 (Jelly Bean) as most up-to-date version which is still nice considering.
Happily trying to perform Software update gave me a failure to register the device… Very nice… very descriptive… what to do next?
Try this first – check your device clock. If it is behind (this device still cannot maintain time automatically), you simply need to adjust the time and try registration and update again. This time you most likely would succeed.