I have one too
I've had one of these since January. I have experienced a crash or two, however one hasn't happened in ages. There is one complaint tho, on my original MacBook Pro the card doesn't stay in very well at all. A slight knock on the cable pulls the card out and means waiting 20-something minutes for an fsck to finish. Whether this is a fault of my laptop or the card is something I don't know. No complaints about the performace tho!