I have not ridden a Spyder in the past but have been on a quad in the past- it was fun, but it did make me feel like I would get tossed off in a harder turn (so I never wanted to own one). Riding on 2 wheels seems more intuitive (well, we’re all bikers here) and the bike becomes a natural extension of the body (or it should seem that way). My neighbor’s BIL last year bought a GW trike - nice and lower mileage that he bought for $15K- but he rides VERY slowly, and usually wants to ride with other retired firefighters he knows in group rides (and when he told me how long said group ride is, it would be the equivalent of me taking the ST for about a 30-40 mile ride, so not very far). I rode with him once in the past and had to keep looking back to see how far back he was (it was only 3 of us)- it’s hard to ride with someone that is either not comfortable on their ride or downright afraid of it. They can also be a traffic hazard if they don’t keep up with the traffic flow.