they are really good for steet gurrented aginst flatspots

They're extremely hard, super dope for skating spots and all that but i wouldn't suggest it for skating a park, stick with something a little softer like a spitfire (made by the same dudes of krooked, anti hero, thunder, and real)  thats not a 101 or any other wheel that isn't in the D scale of duro. If you're looking for something that will hold up against flat spots and don't wanna be on a slip n slide check out bones wheels they're dope too. Darkstars are still great quality wheels though, they're made by the same guys that brought you blind, almost, tensor, enjoi and darkstar boards so you know its legit.

  http://www.utilityboardsupply.com/get_list_120 .htm