With me it was never my back that hurt most, I always started getting stomach cramps, similar to doing too many sit ups, after about 4 hours of pushing the Alaskan. I affectionalty called it the "puker" and eventually installed a crank handle and rope to feed the saw, and that was much better. I've never used the Logosol, but from some of the positive feedback from folks in the Forum that have one, I'd be looking at one real hard. A CSM will cut wood, but don't mount your favorite saw to it, because it is very hard on them, at least in my limited experience, maybe 2 summers of using one. That's how long my favorite saw lasted.