I have both the BTC808 and Tzumi universal keyboards. Tzumi looks better (black keys on black) but the BTC has DEL function (by pressing Fn+bksp). Otherwise they’re identical. I remapped some keys with SharpKeys. Turns the MiPad2 into a fully functioning clamshell-like laptop at 548 grams complete w/ esc and f1-f12 keys. Took forever to find keyboards that weren’t ipad-specific and support all three OSs…they’re getting harder to find