The Smoke rear tire has been incredible for powering up the loose trails at my local bike park, where the soil is made of coarse sand and gravel. The grip it provides is incredible.
The Dart is less impressive. It washes out if it touches leaves or gravel or really anything that isn't dirt, and you have to lean the bike over quite far to make the side knobs grab the dirt. Once the tire is leaned far enough over, however, it is absolutely locked onto its line and does not move.
Overall, impressive for some really old tire models! I think they may be a bit expensive for what they do (especially Dart).
