This is just information for anyone considering the move. I'm not looking to debate the pros and cons with anyone.
To start, I am not a very aggressive rider and I put on a pretty average amount of miles per year for living in the midwest.
I installed last winter a 245/50 raptor on my bike and kept it at 32psi pretty much all year except the experimental phase of figuring out where to set it. I went with the 245 because I have an inner douche bag in me that has a tribal armband tattoo and demands crap like a big fat tire and a 2300 cc motorcycle. The tire was a tight fit and on occasion I wondered if it was rubbing anywhere. I would occasionally hear some strange sound in parking lots but never saw any evidence of it.
Everybody decribes a car tire as feeling the road more. What I think happens it the road pushes the tire around more. If you come to a stop and have a left to right incline, that tire will want to be flat, and you will have to fight that by holding the bike upright. Driving, the tire gets the same treatment, it's more noticeable at slow speeds. When making a hard right into my driveway, the bike would want to go upright when the tire hit the curb.
Turning requires a little more effort, nothing you need any muscle for. In a sense the turns at higher speeds feel more secure as the handle bars give a more consistent feedback that you are pressing in. You don't tip the bike into a turn, you press and hold it there and when you release that pressure it goes right back up right. The period of adjustment to this is very short. I did manage to scrape pegs more than once and the rear never felt like it was unstable in anyway.
In parking lot maneuvers or slow speeds the car tire is a lot more work, the bike wants to stay upright always. This combined with whatever flaws from the road and you have to remain more focused on the low speed work. This seemed more evident with a passenger.
I decided at some point last summer to go back to a MC tire when this was done. I didn't mind the car tire but the bike didn't feel as nimble with it. I never felt like it was a hazard or unsafe riding it. Earlier this week I ran over a large bolt and elicted to just replace it as I felt like puging a tire that requires so much flex would be a bad plan.
I rode home today n the new MC tire and the bike feels more nimble and light, I had to adjust to putting less pressure on the bars and now I have to actively hold the thing up at lights. All in all, it was the right move for me. If I rode high miles I would consider the car tire a solid option.