I've been to Barney's a couple times since I've been here and after sampling some of the other coffeeshops I'd say their quality is relatively on par with the majority of others. What separates Barney's from the other guys is their location, atmosphere, and accommodations. At every table there is a volcano vaporizer, an lcd monitor playing something I can't really describe(similar to music videos), and an ashtray. There is also table service here which is also uncommon, but very much so appreciated.
edit: Definitely check out their Dr. Grinspoon as that is a one of a kind bud.