I have the viair set with 100 percent duty cycle, but I cannot find a good place to mount the compressor. I am leery to hook it up under the TJ. I may just install it on one of my trailers instead.
They just didn't leave any room under the hood of a 98. I did put an external air filter on trying to make room, and it looks like it might barely fit where the stock air box would go, but there is nothing flat to mount to. I know I don't want to mount it in the Jeep, so I may just carry a portable instead.
So while you are contemplating price, maybe contemplate where you would mount it too.