Thus far, I haven\'t really had any problems with either the SanDisk CF or SD cards, having them for about a few weeks now. I have other SanDisk readers (one for the new sony memory stick pro and the 6-in-1 reader, the former for months now) and I have yet to encounter any problem or defect in workmanship.
Lexar is a reliable brand though (I do have their Sony Memory Stick cards) and they do make some pretty good products -- regrettably, one of their readers does not work in *nix, therefore I don\'t use it too much anymore except on the only Windoze XP machine in the house.