Hope their boot selection is better than their other gear selection; I'm not impressed with much in their camping department.

I'd use the gift certificate for golf or other sports gear, and take that money to a backpacking shop where they not only will have better quality, but are also more likely to have people that know how to fit you.

I'll freely admit this is highly biased, and based on a lot of browsing-but-not-buying at Dick's - and probably some terminal resentment that they ruined Galyan's when they absorbed it.