I've got a 2000 SP 500 with Holeshot ATR's on ITP type IV rims. I put these on after the stock tires were nearly bald, and I LOVE these tires. I'm mostly riding gravel USFS roads and dirt trails with some creeks, rocks, and tree roots. Occassionally the trails are muddy, but mud isn't the usual terrain for me. They hook up on anything and have held up really well so far. The ITP rims are offset so I have a pretty wide stance and can crawl over rocks and boulders even better than my pals on their 2006 SP 700's with the stock tires. I also ride all winter and they are great in the snow. I guess the two biggest downfalls are that they really throw up the mud, when there is mud, and they are really noisy on pavement (my machine is street legal here in Idaho).

BTW, I've got friends that also rave about the Bighorns. They do alot of riding on tough desert rock/sand and the Bighorns are comfortable and incredibly durable. They will more than likely outlast my Holeshots.