Buffers work great for minimizing arm/shoulder strain but I've never found them to be able to better what you can do by hand with proper time, technique, and lots of effort. That said, they certainly make it easier/quicker. You will need more than a few applicator pads/covers. Orbital buffers do a great job and are much safer for the finish. Radial buffers can swirl/burn a finish much easier. Stick with an orbital.

Hope this helps...Lee