I got the air ride with my new L4060hstc a few years ago. Can't compare it to the stock seat I never had, but I like it. As others have said the OEM air ride is a Granmar.
You do loose the ability to flip the seat up & run the PTO. I could do that on my old
L3200. Now I have to put a couple rocks in the seat for it to not turn off when I get out spinning the PTO generator. I could bypass that sensor or put in a switch, but haven't had the time or motivation for as little as I use the PTO generator.