One of the best orbiters I've ever used. I had the opportunity to use this model at work before buying it for myself and I'm glad I did. You get what you pay for and it's worth every penny. One of the things I like about this model is the position of the button. This is a 3-position knob that sits next to your thumb and makes it easy to adjust the speed. Another feature I like is that the pivot point of the valve is recessed into the tool. Other grinders I've used had a valve pivot above the tool which is the pinch point. I got pinched, not much but enough to annoy me. This 3M model eliminates that problem with a recessed pivot and is very comfortable and easy to use. The only downside I can think of is that if you want to keep sanding to a minimum, this model won't fit. I usually work at a downdraft table, so this isn't a problem for me. Luckily 3M also makes a model with a vacuum attachment and I'm sure it's just as good as this one. Have fun grinding!