I've been using it for about 4 months and I'm quite pleased with it, for both road and mountain. Most recently, I rode my mountain bike through water crossings and sand, followed by fine, dusty soil. The next day I just wiped the whole thing clean. I was really surprized that I didn't have to wash and re-lube.
On the other hand, I found that it didn't hold up to NorCal mud, nor our rainy season.


Other products I've tried:
White Lightning; stopped using on the MTB it because it leapt off the chain, if it thought it was approaching water. But not bad for road.

Rock n Roll; on the first few uses, I found it holds dirt really well. Even on my road bike, my silver chain was turning black and gunky after a few rides. I really wanted to like this product, too (I'd read some great reviews on it).