I posted this a few months back.

I guess it's as simple as this.

It appears that most of the tires on their website are approx. $30/tire (some a bit more, some a bit less). The mounting kit (which is apparently a must) is an additional $40-$50. So, you are out roughly $100-$110.

If it's junk, you've burned a C-note. If it's the answer to all of your flatting issues, and you're happy with the ride of the tires, it's the best $110 you've probably ever spent.