I don't have any experience worth this product but have bought a few Carson accessories/ products ove the years and have not been happy with any of them. What phone do you have? I have a Galaxy S7 and Note 5 and use the S4 gear adapter I bought from Camofire they also make one for bigger phones. This adapter odds far from perfect but is very adequate and has great adjustability.
http://www.opticsplanet.com/s4-gear-zoom-xl-smart-phone.html
