I combined mine with a small log arch to literally skid entire sm-med sized trees out of squishy back yards.
Use care. For one man to operate the thing you must be on the saw's trigger, AND be tailing the rope. If you're working a straight line, if the rope lets loose from the far end, the rope can recoil directly back to the winch, POW!. The thought of this freaked me out, as I was really pulling some substantial weight. I ended up wiring the trigger so I could move away a few steps out of line, and tail with both hands a distance away. The moment you release tension on your end, the winds around the capstan will loosen, even though the capstan is still turning.
I wouldn't recommend sticking a 394 on the unit. It'll give you ample power, that's for sure, but too much power can mean you'll break a shear pin (speaking from experience). I had a top-handle Shindaiwa on it at one point and it did OK because the winch is geared so low, but I would still recommend a mid- saw, 45-72 cc range. Good product!