I am about to pick one up. They sell the "Ultimate" model that has interfaces for PS2, GC, and XBOX in one and only costs $10 more. I messed around with it at the store several times and i liked it a lot.
The buttons are a little stiffer than I like compared to my Happs/Cherry combos, but for the price and production quality, I like it a lot! My local gamestop has one that has been handled a bit roughly and looks like it was slobbered on. That is their only one in stock and I am not willing to buy that one. So I will either mail-order one from them or wait until some sap buys that one and they replace the stock.
Cameron