Installed one this summer, hated it right away. Over shot it, missed it you name it. Adjusted about 1/2 dozen times, took it off boxed it and was about to mail it back after talking with them. Thought to try a couple different things first and ended up getting it set pretty decent. I really like it now. Don't exactly remember the steps that made it work, but takes a little tinkering. Couple other guys I know, it didn't work for them. ( patience to set up properly )