ironhands,

forget the pump version of the OS if that's what you are talking about.
sure it's just fine if it's dialed in and stays dialed in, but if just a fragment of crap gets through and clogs the regulator, or the pump goes south, you'll hate the pump like nothing you've ever hated before.
i know, i had this problem........took a new pump to find out, and the engine only had 2 runs on it.
i converted my pumped OS back to a non pump version, and have enjoyed the motor much more.