Not so bad, but I stuck with 20:1 even after breakin and I also went full synthetic after breakin for greater lubrication protection and better cooling ability.
Also was not wailing on it during or after breakin, they are unforgiving when you run them full tilt all the time but are fantastic if your just cruising at 30 to 35 MPH and only needing around a 1/4 throttle to do so.