I did it last year (fwiw, I'm strictly a recreational rider). There are definitely sections where dicey pavement and dirt tracks could be rough on a nice road bike. That said, I certainly saw a lot of people doing the ride on road bikes with super-skinny tires.

As a faster rider, you'd probably be able to avoid the worst of the congestion (both because they'd let you start first and because you'd outrun the rest of us), but there were a couple of sections where things got a bit crowded.

Can't speak to whether or not they have a SAG-wagon - but if that's important to you, I'd suggest calling or emailing the organizers and not relying on word of mouth.

I enjoyed it for the most part, and I plan on riding it again, but I don't know that I'd haul up from Central CT to do it.