I have used the EZpass2, but Superkey is much better ! I received it this afternoon and now I'm using it with Supercard SD, it's working very well. The battery save is such a good thing. The best features are that I don't need an original card, and my DS looks very well without that big EZpass2. And I recommend Real Hot Stuff for everyone, including people outside USA. I'm from Brazil and I've received it without any problems.