Metal shed / Shop 20ish x 20ish

What's the general consensus on these metal buildings? Unless I'm mistaken, my research says that all of these sites such as alans factory outlet, Carolina carports, etc., Are just out of town sales fronts that sub out the work to whoever they can find locally. I read the "deposit" is part of the commission the salesmen collects. Seems like one could cut out the middle man, but I'm not having much like finding someone who builds these sheds locally, I'm finding people who do odd jobs who said they're capable of building the shed. While I don't think it's brains surgery, I'd like to find someone who does this work regularly and can bang the work out efficiently. Has anyone gone through this and have any insight? Just trying to avoid a nightmare. This is in the Mandeville area