I use the TrailAir with Tri-Glide on a B&W Companion hitch. I didn't go that route for cost (less), but, went with the KISS principle. I can remove the B&W Companion by myself and it is, IMHO, one of the finest hitches available. While the air hitches are perfectly fine, they are not a "one man job" at removal, at least not by my 145 lb. arthritic carcass. They also leave rails in the bed of the truck, while the B&W does not. I also have infrequent use for the goose ball portion since I live in the hinterlands and gooseneck AG trailers are as common as any other form.
As for the TrailAir Tri-Glide unit... I won't tow a fifth wheel RV (that I own) without one. It does handle all the motions of the trailer, something the air hitch doesn't do, and it does it quite well. The truck hits a bump, then the trailer hits a bump, but, one does not affect the other. It is, however, a bit of danger during the first few times you use it...the desire to watch it doing its thing instead of paying attention to the road can be dangerous... You can't get around the fact that the pin weight is in the bed of the truck, but, that's all I feel; a loaded pickup truck, no different that having a load of mulch or gravel in the bed. No tugging back and forth, no up and down pounding; just a loaded pickup truck.
The added benefit? It is, as you noted, less cost. :)