We've used them years ago, both brands, and I'll tell you now that you had better be ready when you pull the trigger. Don't use either of them with anyone standing near you, and have the project securely attached to something that's solid, or it will go flying off in any direction. If you pull the trigger before your ready, it could possibly lead to serious injury with a kickback or a runaway tool which could do harm to you or anyone near you. Plus, it would most likely ruin whatever your working on, by running across the face of it. Please be very careful if you do decide to purchase one of these items, they are as dangerous as anything that you'll ever come across in your woodworking trades. There's vidoes and horror stories out there that are extremely graffic and gory in detail, I think that you can see some of the stories about the accidents on You Tube. I got rid of the ones we owned years ago, they were to dangerous to have hanging around, and I didn't have much use for them for years as we stopped doing that type of work.
Len