Mike,
I did my first cut of the year today with my Raptor SD. I can tell you that the tip speed is way past supersonic and although the grass wasn't completely greened out and much more dry (dormant) grass involved which is harder to cut, it again made the yard look smooth as a newborn babies butt and the wider tires, better seat and electronics is well worth the 500 bucks.
But then, you have to be happy with your purchase, thus, I say purchase what you think will make you happy.
Good luck!
Max