BurnOutPC.com reviews some XTracPads Accessories

[Jason]

"The goodies XTracPads send me were really effective in making my mousing
experience a lot better. The MouseGrips are something that I use daily on my
MX510, and I won't take them off ! Their great. Looking at the MouseDotz,
it's just a matter of preference, their pre-cut and fairly thin so they
should stay on your mouse for a long while, but teflon tape works just as
good and comes with any mouse pad you buy, also with a XTracPads. The
Instaglide does make your mouse glide better, but it also requires constant
swiping of the bottom every few days so I wouldn't really want to do that.
But yeah it works. Overall three nice products, I was most impressed by the
MouseGrips."

XTracPads Accessories