My rearsets look a lot like the motowheels MW Billet Rear Sets: 748-998 (perhaps they are? the previous owner of my bike invested some $ there

...)
I agree with Bruce-
my bike arrived set up for GP shift, I was pretty eager to ride it and though I did have the neccesary hardware, I did not change it to conventional.
I think the shifting is a cleaner and crisper (due to direct linkage) and now I am used to it and like it, but I would NOT go to GP shift without good reason, it took me a good while to burn reverse pattern into my muscle memory and now when I ride a bike with a conventional shift pattern, I have to really pay attention to the shift pattern- attention I would rather use on steering, road conditions, traffic, etc.