I actually have a set of those, that I bought for cheap.... I think I offered him $140 and he took it. Cost vs. performance, I've been pretty happy with them, and keep them for loaners and on my cruiser when it's not wearing Sand Skate II's.
The quality seems hit or miss (what I've read on other forums), but mine have been plenty good for the cost. They don't get the traction of the original Skat Trak Haulers, but if you haven't been to the dunes alot, and don't really plan on going back too often, they will work fine. They are a little too much paddle for my stock TRX250R with a FMF pipe, but might be just about right for an ATC's lighter weight.
I'd look around for some used Haulers... Lots of people are coming off their dune season as the temps get warmer. Usually some good deals floating around on Craigslist and forums.