I just bought one on Saturday, the thing is butter smooth. Props to Yamaha for nailing the fuel injection. It's so happy to dawdle along at 2,500, but it builds might fast (well, at least to 7,000, then I gotta shift because it has to be broken in).
Another thing to remember, this thing looks 100% better in person than in the pictures. It's a friggn sexy bike! I got the silver and black, I'd highly recommend it!