My handhelds got serious competition today... my Ipega bluetooth controller arrived, which works well with my 7'' android tablet (Kindle Fire HDX) and my 8.3'' x86-Windows-tablet (Lenovo Thinkpad Tablet 8). Sorry, guys. ;)
Even my 10'' iPad fits in the telescopic arm, but then it looks a little bit silly. And the controller can't handle the MFi protocol, only iCade-compatible iOS-games.
Folded together it is not much bigger than my Vita with its grips: