They look ultra aggressive for the street since they don't have the rain grooves, but believe me when I tell you this: I put about 1000 miles on these tires on the street in different conditions(90*+ canyon runs, 50* canyon runs, damp roads, light showers, commuting, basically aggressive street riding) and the grip and feedback they provide is lightyears beyond the stock tires. They are really soft, and they warm up very, very, very fast. The sidewall is not as stiff as the stockers, so it's a lot more compliant. Cold dry grip is amazing. I was able to drop a knee down in 50* weather in a decreasing radius turn without any sign of instability. And I'm a midget so I really have to crank the bike over and hang off like an orangutan to drag a knee. There was some cold tearing though. Once up to temps in warmer weather, you'll feel like a superhero going through corners. It really, really is THAT good. Braking performance has increased significantly as well. As did straight line stability. It takes a little bit more effort turn the bike since the front tire isn't triangulated like the stock Pirellis are.
I don't really have anything bad to say about these tires. Tire wear really isn't too bad, and I'm sure I can squeeze about 3000 miles out of the rear with 7/10 canyon riding about 2-3 times a month with commuting thrown in the mix. On the track? Maybe 2-4 track days depending on how aggressive and fast you are. I mean, if you're in the market to get a high performance tire like this, tire wear should be the last thing on your check list. I guess you should watch out for cold tearing when you go on canyon runs on cold days(or days that become cold out of nowhere). I haven't been able to test these out in heavy rain yet, but I'm sure they'll perform decently if I take it easy.
Despite how it looks, it really is a great tire for aggressive canyon and street riding. Obviously, they will perform much better in warmer climates, but cold grip is there, and they DO grip well in the cold. AND warm up time is extremely fast. I don't know what Michelin did, but they pulled out all the stops on these Power Ones.
Keep in mind that these comments only pertain to the street version of the tires. They come in many different compounds in race trim, and those are available only through trackside vendors.