i bought a 10.1 ultima, just altered it myself and have a 32gb card in it, works well, battery is poor at 4 hours use or less on a full charge, but use a memory manager and other free apps seem to have no problems so far filling it up with games, apps and music and video, for the price can't grumble at all, already posted to support about it coming with other person details and addresses, emails and wifi settings, online card details and other private stuff like photos, but thats life, took all of 1 min to wipe it back to default and clear it....
girlfriends now very happy playing on it, saves having laptop on all day for facebook and games :0
I assume you've managed to root it?