Super rigid. Used this to mount a Mosconi Pro 5/30 and 6to8 Aerospace, as the behind the seat rack wasn’t wide enough to accommodate the big 5/30. If looking at this as an option, be sure and get accurate measurements of the equipment you plan on using. As seen the photos, I had to make angled risers to give myself room to terminate all of the wiring on the 5/30. Still, this was the perfect solution for getting the 5/30 in while also having the stealth behind the seat enclosure installed.