I have USAA and they do not insure motorbikes, they farm it out through Progressive.
However, since it's Progressive via USAA, I can call USAA if Progressive gives me a hard time, and they handle it, (USAA is awesome).
Having said that, I've never had a problem with Progressive. Great customer services, the prices are good, coverage is fine and friends that have Progressive say that payouts on claims is no problem, unlike other insurers who try to screw you around, (State Farm, from a buddy of mine, he now uses Progressive). I say Progressive.