I like em. I got one a couple weeks ago and have to say I have used it more times in two weeks than I have used my oheler this year.
You have to add some spacers to get the bullet/sensor clearance correct, but it is easy.
Strap it on and you are ready to shoot.
It cuts on automatically when you plug it in and is ready to go. The shot string shown there was a rifle I had just cleaned so the ES was pretty wide.
pretty neat deal and way more convienent for the everyday type stuff, but if I could only have one I would keep the oheler.