Yeah. I know what you mean. DX has the prices and all, but their stuff isnt of the best quality. I ordered a 4GB MS Pro Duo for my PSP, and the card itself chipped in half. Im now using their mSDHC to MSProDuo adapter, which works fine now, but has terrible read/write speeds, though the mSDHC card I have in there has great speeds.
Im completely happy with my current AK2.1 that I got from DX, and I cant see anything important being added hardware wise save DSi support, which is pointless anyway since they have the AK2i. Now what would be bad is if these were some sort of clones of another card.