I don't know that brand, but I moved from 2 wheels to 4 wheels ages ago (Rimowa) and I find 4 wheels much more convenient. You might lose just a little internal space (2 more wheels clipping the corners) but when travelling through a crowded airport or station you take up less floor space, there is less opportunity for others to fall over your towed bag, and it's easier to kick the bag along when waiting in a queue.