I have two cpr HOB fuges, a small and a large. The larger (25") has a built-in Back Pac skimmer. The fuges are fine, but the skimmer is next to worthless--it either foams up and pulls nothing but water, or rarely does anything at all. I've adjusted it everyway possible, but with few working results. I know there's stuff in the water, because I put my old SeaClone back on and it pulled all kinds of stuff.
I would't advise spending the extra money for one with a skimmer. Otherwise, I like them. You will need to get a strip light if you want to grow macroalgae in it.