This has been the shoe of choice for my 18 year old son when he competes in trail races.  Despite his young age, he is a very competitive distance runner (with overall wins in marathons, halfs, and trail races) so he's very particular about the shoe he wears for each type of race or training run.  He wears a more stable shoe for his daily runs since the Salomon would have trouble keeping up with the 100+ mile/week training schedule.

The snug sock-like fit and the quicklace system are a major plus.  He finds the shoe to be a big advantage in ultra trail runs where the terrain is extremely steep and often muddy.  These shoes have helped him to avoid the falls that are often a problem in those type of races.