Express seems geared towards two types of people: Those who know what to look for and are patient enough for it to show up on the floor and not be overpriced and those who don't really care what they ride. The first bike I got there ($175) was, all in all, a fair if not spectacular deal. I spent 6 months staking out the place for this one. The second bike ($125) ""worked"" but was not tuned up at all, the rear wheel was defective, the crank was out of round and the brake pads were crumbling. I bought the second one after two visits.\r
In both cases, the customer service was indifferent. I got the the feeling that they were doing me a favor for selling bikes. When I asked about sizing, I literally got a shrug of the shoulders (and ended up with a bike that was too small). Some of the answers I got were just plain wrong.\r
All in all, with the right approach, you will probably get what you pay for at least some of the time.
Pros: Good mission(?), occasional good deals
Cons: ""used car lot"" atmosphere and service