Don't own one. The concept is good, but so is lining up the bell of your sight with the circumference of the peep and making sure your level is centered. Like any sight, it's a small part of the shooting equation and they will all work to a extent. Buy what you like the best and what you feel is made the best. To me, it's all about pin clarity and micro adjustments. Spot Hogg and viper along with CBE are all good choices. I think just about any of the companies are making quality sights now. :way: