I went to Roozens for the first time today. It is an interesting place. You definitely need to know what you are looking for and what you are looking at, but they have a lot of stuff. They also had some things that are hard to find like Cyclopeeze at a fair price.
I went once and discussed a pair of true percs and was given a fair price. I went back with my wife later (she likes to help pick out the fish). I got a different price from a different person, but it was less and both prices were fair so that was OK with me. I was a little surprised that the guy was hesitant to sell me two clowns out of different tanks. Its not often you hear things like that from a shop. He insisted on putting them together first to ensure they wouldn't fight. And they didn't, so that was good. After he bagged them, he wrote the price on the bag with a marker. So, no issues at the register either.
Overall, it was about as good an experience as any LFS. I'm sure I'll shop there again.