I don’t know anything about Sly cues, but I remember people saying great things about them.
I like my Treadway. It was a big adjustment from the Verl Horn I played with for over 16 years, but it’s a great cue. Now that I’ve adjusted, I like it more. Be forewarned though, if you have Josh build you a cue, it’s going to be a while before you get it. I waited nearly three years for mine.