I am sure there are some out there that are well worth it but I feel an in person tune with data logging will beat any email tunes. On a few other platforms ive done canned, email, email with data logging, and in person tuning and having it done in person always seemed to be better and more drivable. I have heard lots of great things about Kory, I don't know if he is the best or not but I'm sure u can't go wrong using his tunes.
I am new to this platform so hopefully more experienced members will chime in for u