I bought, installed, ripped out, and returned a Logitech Pro Cam 5000 (think that is the correct name) 3 or 4 years ago. Immediately after installing, on a computer that was all of 5 days old, it sent me into a series of crashes that had me almost reinstall Windows. Turns out they had released a really poor driver - really poor! Not to trash Logitech's web cams needlessly but that one incident has kept me from trying another of theirs ever since.
Jim