skeptical of it at first. But then I saw more and more Blackstone reports on it being so incredibly awesome that it really doesn't matter.
I switched to it from M1. I didn't notice anything other vastly reduced lifter tick and a few extra bucks in my wallet. So far it's nothing but a winning switch in my book. This coming oil change I'm sending it out to get tested, so that will hopefully be the final decision maker (not that I really need any other confirmation at this point).