it seems to me that the engine overpowered what little traction the "surface" it was on provided. loose dirt, gravel, etc tends to provide little traction. as i watched it go up that hill, which was extremely steep, i noticed quite a bit of dirt being shown to the bottom of the hill.
The moderator over at Wild Hobbies saw it 1st hand and he says it's awesome. Check out the link and look for the posts from Kerry G.
http://wildhobbies.com/phpbb/viewtopic.php?t=938
Also of note is this second link which answers a few of the standard versus optional questions.
http://cengenesis.com/news/default.a...articleid=1208