I use these shorts (and other similar shorts) for single-track, functional fitness (kick boxing, boot camp, CrossFit), and adventure races (e.g. ToughMudder).

Pros: graphics are very clean and clear, they have the Velcro waist and a redundant drawstring, the length is just right for me (long enough that my thighs are mostly covered, and short enough that they don't grab my knee or quad in a deep squat or kick), the crotch is very flexible and non-binding.  Best of all is the foldover flap to protect your stomach (roll) from Velcro chafe.

Cons: the material is extremely lightweight, in a cheap feeling way, not a performance feeling way.