I think the Air 540 is probably the best cube style on the market in terms of practicality and performance.
No it's not.
The aforementioned Lian Li PC-D600 does everything the Corsair does, only better, and then some.
This is before even venturing into CaseLabs' offerings and similar "craft" cases.
I think the Air 540 is probably the best cube style on the market in terms of practicality and performance.