While this drive is very cool (albeit slow as everyone else has pointed out), it's completely worthless when it dies within 6 months (purchased June 18). I've seen several other posts here of the same issue: just decides one day to never mount again. And even though there is a 2-year warranty, LaCie doesn't want to honor it because I can't provide a serial number.
For what it's worth, there is NO serial number on the key itself. Apparently the S/N was on the disposable packaging, which as you may guess, was thrown away back in June.
So, for a product that has a 2 year warranty, and has only been on the market for 6-9 months (so there's NO WAY ANY OF THEM could be out of warranty), and that I have a receipt for, LaCie still won't honor their warranty (at least so far). I'll edit this review if in fact they do decide to honor the warranty, but this loophole/runaround is inexcusable and I'd avoid this purchase again because of it.
UPDATE - FEB 2010
Finally after about 3 weeks of arguing, LaCie agreed to let me send it back so they could "look" at it. On January 5th I received a new, in package, 8GB key.
While I'm happy I finally got resolution, I'm not happy with the experience, and I can say that even today (Feb 20th) I still haven't used the key. I simply feel less than overwhelemed with it now. But you can bet that I didn't throw the packaging away this time! Just in case.