I like AC Infinity, it's hard to beat 1/2 the price of Gorilla. I have a Gorilla 5 x 5, and I haven't set it up yet. I wish the AC Infinity were at least just slightly taller at 84" not a deal breaker, but the Gorilla is 83" and expands to 95" I haven't used the extensions with my Gorilla 2 x 4's yet, but it's nice to know ya have em. I really like the mounting thing/ and cord pass thru for the control panel with the AC's. I gotta figure something out for the control panel on my Gorilla's. I'm thinking maybe of cutting one in my Gorilla and then hand sewing it with nylon thread they use for sails IDK? though still thinking on it. AC tent quality and zippers are pretty good, the gorilla are better though.
They have a ventilation kit now at AC with everything. Myself I'd get the 6" with the better controller. That's a pretty sick 5x5 setup for $230 w/ 5 x 5 tent $430
https://acinfinity.com/hydroponics-...smart-controller-carbon-filter-ducting-combo/
Take your time and maybe piece it together over time...buy once get what ya want