I haven't, but to highlight the flip side - one might not want to put all their recordings one one drive that big in case it dies.
I'd rather pay less for 2 or 4 smaller drives with the same total capacity and not have all my eggs in one basket. There are benefits to only using one drive, but I think they don't outweigh loosing everything in one swoop with a 2TB drive - plus you can't use the extra space on a 2TB drive for anything else but connection with the DVR.
Thanks for the heads-up though, that's a good price for all that in one drive.