I've used Optimum's polishes (polish, compound, hypercompound) in their old versions for years. I did like them for the no dusting deal, but they took forever to use. I got excited and bought into the polish II, compound II and finish but I bought right before they switched formulas to the SMAT technology. They were ok, but I still found myself reaching for 105/205. I finally used some of the "new" formula stuff and I do like it quite a bit better than their old stuff, the no dusting is great.