My husband got started doing it for sales. It works a lot faster and in the hands of someone who knows how to use one, can eliminate a LOT of clipping. All of our calves that we are getting ready to show or sell get torched first thing. You can eliminate about 3 hours of blocking out in 20 minutes. However, in the wrong hands you can burn one easy. Plus they need to be reasonably free of debris, mud won't burn but burrs will light up quick!
The downside is, for a week or so afterwards it takes lots of TLC to get the haircoat acceptable again. They will be like velcro at first, everything sticks to the singed hair.