I got two of these. One for a Windows system and one running UBuntu. Both work extremely well and are plenty fast.  My ONLY gripe is that for some reason the fan on the UBuntu box whirs up and down  too much.  It isn't loud, but its distracting.  The windows system winds up  and stays up for a while, then slows and stays down for a while..I'm not sure how long they will last, but I've had them for several months now with no issues.