I had noticed this question and went riding this morning with a couple of friends, one of whom had the Cadex AR mounted. You can easily get these over here in the EU but they're not frequently seen, maybe because they're not cheap.
I asked him what he thought about the tire and he essentially feels that they're ok but that you can easily get other brands that offer similar performance at a lower price. According to him the grip on hardpack is excellent, they roll fast but not exceptionally so and they wear well but the drawback is that there's not much grip when it's wet. Well, it's not a mud tire so that's to be expected but according to him they're also sketchy on wet tarmac, which is a problem because it rains a lot over here and it's difficult to escape significant stretches of tarmac befor arriving at gravel paths. They hold air well.
His bottom line was that, taking into consideration the price, he won't purchase them again, mainly due to grip on wet tarmac issue. Depending on where you live that may or may not be relevant.