I’ve had my OS27 with track extension for a few months now. I’ve milled many logs of southern yellow pine and some oak. The OS27 has handled them all very well. Customer service has been better than any company I’ve ever dealt with! They contacted me before the mill arrived, answered many questions for me and even provided a PDF manual so I could get specs to build the concrete piers ahead of time that my mill bed rails would rest on. When I first got the mill I found the foam padding for the handle was torn and they shipped a replacement right away. Top notch service team! Awesome sawmill!