Great location, excellent selection, and wonderful, knowledgable staff!! It's slightly expensive but there are frequent and excellent sales, especially if you're a member.
You can't beat being able to try out your hiking shoes on the mountain and having the option to return them after a few wears if they don't work out - can't get that from cheaper places and websites!
My husband and I have purchased tons of stuff here over the years and we've had wonderful luck with the product quality (if it's here, it's probably excellent) and the people who work there actually use the stuff.
If you know exactly what you want to buy, shop around online and you can often beat the price. But if you're venturing into unknown territory and in need of expert advice, this is a great place to go.