While I don't have an answer for a T4 upgrade,their food production is silly. How silly? 50% more than a vanilla Sim Settlements mud farm plot. They do need power and a significant amount of space,though. But I've managed to fit ten of those things quite comfortably on Abernathy Farm,and at T3,they produce an absolutely asinine amount of food. I don't have exact numbers,since I've lost the save,but trust me. It's worth it. They ARE using a raider look,though,so if you don't want raider-looking buildings,that'd be an issue.