So, these happen to be my favorite plecos. They are a little different from most, as they don't eat a lot of vegetation. They prefer a higher protein diet, and do very well with rock work and lots of current. They are reclusive and spend a lot of time hiding. Healthy specimens dart from place to place very quickly. Be wary of ones that move slowly.
If you can find them for $50, buy them all (or tell me so I can). They used to retail around $25-30, but that was 10 years ago. Typically, they go for $125ish now. It's not a great price, but it's "reasonable" (well as reasonable as 125 can be).
Mine (4) reside in a 120g at the moment. I'm contemplating adding another 4 and turning this 120 into a zebra pleco tank entirely (maybe adding a couple of red severums), but we'll see.