Over all the functions as specified in the product description and feels dibasic. Only the rather stiff spiral cable could be a little longer for my taste: operated on EF-S 18-55mm IS lens in reverse position was a trouble-free, consistent facilitated zoom impossible to achieve. The four included adapter rings (58mm, 67mm, 72mm, 77mm) are made of metal and the thread run cleanly worked beautifully smooth and can be even after being tightened accordingly easily released again.
