Some of the people I know swear by them. One guy ran one batch for 26,000 miles on them with 5,000 mile oil analysis. After 25,000 miles, he chickened out and changed the oil.
It is an excellent oil but expensive. It runs between $4 - $4.50 per quart. They claim it is a synthetic oil but many say it is really a blend. The base oil is a synthetic and petro oil blend.
Just yesterday, I e-mailed the company about this and the first reply was rather long. It said that some petro oils are better than synthetic, etc. I e-mailed back to ask them to classify their oil in therms of "Mobile 1" or "Mobil1 1 blend". So far I have not heard from them yet.