I started off my salt water experience with a little bullet 1. Thought it was a quality unit, so I would asume the larger ones are also of similar quality. Mine didnt work so well, but that was due to the poor pump the LFS recommended. I upgraded the pump and got much better performance.
Later on...when I learned not to listen to the LFS, I used a dual beckett from MRC with a 24" x 8"dia. extension, making it about 50"tall in total. It was relatively loud and a real power hog, but I gotta admit, it pulled out junk like crazy. I cleaned it 2-3X a week. I replaced this skimmer with a deltec for a couple reasons. The biggest being I decided to downscale my plans, so I didnt think the giant beckett was necessary. I would say it performed better than my 851, but it also drew 6x the power...