I have a DeWalt horizontal-handle, and I can't imagine using a vertical handle. The first time I saw a MS in a store with a vertical handle, and I grabbed it to try, my wrist gave me a little twinge. It's just plain bad ergonomics. For horizontal handled saws, simply grab the handle with your middle finger in line with the blade and visualize pulling down with that finger around the circumference of the blade at a moderate rate. An over-aggressive feed rate will cause deflection no matter the handle. I also use mine with either hand at times, and the trigger is two fingers wide, so when I'm using my left hand on the handle, I'm actually squeezing the trigger with more of my left ring finger than my pinky, and it's not a big deal at all.