These are almost a victim of their own success. They can get very crowded - to the point where it becomes annoying. Waiting in line to get to the bins...getting jostled around a bit... It takes some of the fun out of casually browsing through everything. The focus seems to be more on "used" than "collectible." If you're just looking to pick up some old, easy-to-find stuff on vinyl for fairly cheap prices, it's fine. There are always some rarer finds, but not much you couldn't find on ebay at the same price (or less) in a matter of minutes.
Overall, if you go record shopping on a regular basis, this is nothing special. Well, other than the fact that you can drink while record shopping, which I fully support. :-)
