Question for PSR3000 Experts

Since the PSR3000 has been out for a while now, does anyone know if there are any differences between the earlier production units and the new ones? I am looking to buy a used one but I want to make sure I am not missing out on any new changes. I am assuming the only difference would be firmware which I could get the latest version (1.55) from yamahapkclub website.

Thanks,

Nick

I don't think there have been any changes...but, Gary is away...to verify..