Our church bought one, a Madi-USB card for Soundcraft Expression 3, and it worked flawlessly. We initially set up the mixing console and the digital snake and realized that we couldn't use them unless we had the Madi-USB card.
We bought one of these, and it took only 3 days to arrive from Germany. The console and the digital snake began to communicate right after the insertion and rebooting of the console. It's made of quality materials and works great.