Thats what I said, but the mouse is so accurate that its easy to use at 4000k after like about a day, but that depends on the person. The only time i do ever need to lower the dpi is when I'm sniping, but with all that said 4k dpi is a godsend in UT3.
Plus another thing I like over the copperhead is that I can turn the lights off on the lachesis.