The Cessna jump seats can be had. I heard you'll find that about $1,000 will trade okay for them.
I like the BAS for lightweight, convenience, install time, and stowability. Whether a guy likes Atlees, or BAS, when stowed, they take up a bit of that space on the sides of the cabin. BAS usually slightly less space, depending on the seat cushion, or lack thereof.
The problem with the Cessna's is they're not as quick to set-up when you want to use 'em, and when you want them, they may have been left at home that last trip, etc. etc.....and they have to be stowed on top of your load when you take them out, so they use some room, etc etc.
A fabric sling seat is a decent way to go for portability, weight, and installation/removal ease. The compromise comes in how comfortable it will be. I've been in some that were more comfortable than a regular seat, and others that were HELL!!! I think the way they're sewn up makes or breaks the design.
Anyone else??
DAVE