I bought the Belkin Multimedia Reader & Writer Expresscard for my new Macbook Pro, and it works exactly as well as a piece of ham. Well, that's probably not fair. I imagine it ejects from my Expresscard slot cleaner than a piece of ham would; but functionally it is the same as ham.
I have tried five different SD cards of various capacities in it, and it failed to read any of them. I am surprised at the poor quality from a Belkin product. After all, this isn't a no-name EBay special freshly shipped from China. It's a BELKIN!
Sadly, the picture I took here was copied off of the camera memory using the built-in SD reader in my wife's Macbook. The model I am referring to here is Part # F5U213 - P10789. Avoid it. It's junk.