Looks cleaner, but allowing to plug the cables into the back, somehow (adapters from standart pcie plugs to proprietary, higher gauge cable ones), would make it even cleaner and less cluttered. Now the mess of wires is just moved from the front to the side a little, instead of being far in the back, near the motherboard, where routing them out of sight would have been easy.
Meh looks kind of toyish with all that plastic. I prefer the look without em. I also have 2x120mm fans blowing air at the cards so this would restrict the amount of air hitting the cards.