Keep in mind that the Ncase M1 (manufactured by Lian Li!) comes with all the alternate mounting hardware, whereas the caselabs alternate mountings (which are fewer) are available for additional purchases.
I have the Corsair air 240. It looks sick but the quality could be better for a $100 small case. side panels are kinda flimsy, and my window came scratched out of the box as it has for others but corsair sent me a replacement no fuss.