I've been meaning to write something up for it for a while now... Everything to N64 obviously rock solid. GameCube is generally great with some tweaking required for some games, Wii hit and miss, PS2 similar to GameCube. Does manage some Citra well enough too.
I will say that the version I have with the coloured buttons is known to have its buttons stick in due to weird tolerances, but after breaking it in (10ish hours playing HeartGold) I've no issues. Apparently the black model doesn't have these issues, so I did actually grab one on eBay myself for that price lol
I just ADORE a 3:2 screen. It's the perfect ratio for slim borders on 4:3 and 16:9, with perfect GBA. System has a great battery, and you can pick whether you want the D-Pad on top or bottom. I really want the KTR1 to do well enough to warrant a KTR2 with a bettery CPU for that full Dolphin/PS2 compatibility but it definitely is worth £110 as-is imo.