For anyone in Sydney  there is one at Coogee Diggers along with 10 other machines including a Star Trek Pro.

I've played the Mustang quite a bit and while I thought it was going to be a complete dog at first it has grown on me a bit and I'm hoping it will turn out to be a decent game in the longer term. It's fast enough, sounds aren't bad except the horse galloping (it seems a bit out of place despite the Mustang connection).
It's a bit like an older pin in that the playfield is quite open and not very cluttered. Some simple long clean shots too with a bit of a difference in that the top lanes have a V orientation and they include a fixed row of lamp (spinner moves them, so not totally fixed ) as well as a lane change row. It's got drop targets and I'm a sucker for drop targets! It's bright and colourful and the LEDs are vibrant.
I'm usually sold on a pinball within a game or two otherwise I tend to give it a skip from thereon out but this one is one of those rare ones that has slowly gone from dud to OK for me.