I got one of these the other day as I have thousands of 308 win cases to prep. It works but it is kinda cheaply made for the cutter. The blades are made of sharpened spring steel. They are very thin and I don't see them lasting very long.
The cheapest part of it is the adjustment collar. It makes it so you can fine tune the length you want. Sort of. It can get out of alignment very easy. You have to make sure it is not off center or the cutter will lift up and down.
I got mine with the drill adapter. I was using it with my corded 3/8 drill. It works, But it is made for the use of a cordless screw driver. I am going to get a cordless drill to run it. We will see how it holds up.