The "Y" reversers are not as bad as some people say. I used them in two different planes for 5 years. They are a royal pain to set up as the reversed servo travel is not always symetrical with the non-reversed servo. Having a fully adjustable horn is a necessity.
With that said, I have only had to adjust the reverser during temp extremes. ie..summer/winter. I have finally switched to the Futaba 9C that does have twin-elevator servo capability. I'm sure that sells a lot of 9Cs that would have otherwise been 7C sales.
While the Y reverser is not ideal, it will work. Kinda like a nylon MA prop.