I have an OS31 with trailer, 1 extension and the 14 Hp electric start Kohler engine. So far the saw is working well and has proved capable for the milling projects I have been doing. The saw sets up quickly and is accurate. It tows well and is easy to get into position. Things that could take it to the next level: a cam style log dog verses the screw ones and the handle material at the throttle/lube control should be more robust. The handle is now hockey tape. The log dogs swing around if dropped after release and can easily injure you as you flip the log. All in all it is a great mill and will yield many years of lumber making.