I have an R4, it rocks, ect. I'm interested in the 3-in-1. I've heard mixed things about it, though. That it's only compatible with some other slot-1 card, that you have to buy it together, ect. So answer these: 1. How much does it cost? 2. Will it work with the R4? Automatically? 3. Not really a question, but what are your thoughts on it? Is it worth getting?