For the most part I think OS engines are good engines but have to wonder about the VG series with the ABL sleeve. I have heard more negative on these engines in the short period of time they have been out then all the other OS engines made in the last 5 or so years. For the money I think there are better engines out there with ABC sleeves. I do know with the ABL they use nickel and we all know how durable ABN is.