I bought some and am running it in an fs131r and fs100rx. Soon to be in my br800x. Such a difference going to this from Honda HP2. I felt like my machines just were not running to their potential on the 50:1 HP2, and I could not adjust out of the funk. After I filled the tanks with this VP I adjusted the carbs and there was a noticeable improvent in top rpm, and they just ran crisper. I am currently using 40:1 because the viscosity is on the low side. Once I get a better feel for what the VP is really all about I'll probably bump to 50:1. So far I'm thrilled. The smell is good, but light. I do like the smell of Saber better, but they are both good. Stihl Ultra flat out stinks, plus it runs too dirty. Never again. I'm no Amsoil fanboy, but Saber is very good. I'm just looking for a cleaner burn. Time will tell.