I've bought and sold a Mustang PJ and a Performer Mustang, and bought and kept a JMJ Mustang. The JMJ is a little too reliced, but is a superb bass .. fit and finish, playability and tone are great.
I'll be trying out a G&L fallout on Friday, so keen to see how that plays out.
I'd love to try a Wilcock shortscale, but haven't had the chance yet.