I have a small pressure washer - 1600 psi - and wanted a small surface cleaner for household use. The PWSC12 worked perfectly and did a great job of cleaning my 35 year old concrete drive.
I bought the 16.5" Westinghouse stainless steel surface cleaner with some reservations. My first concern was whether the surface cleaner wheels would easily rool on my interlock pavers, and secondly, whether the surface cleaner could remove embedded mold between the pavers, which is a common problem in Florida. Both of my concerns vanished one minute after I connected the surface cleaner to my pressure washer. I was so impressed with the surface cleaner that I recommended it to a friend who had bought one.