I have two racks from RBI and it's true, they do ship extremely fast and are of very high quality. I'm not sure on the thickness of their cage though and it doesn't say on their website. You could email to ask what they make it with. My larger rack is made out of 1/2" PVC and the other is made of 3/8", so it seems they use whatever is appropriate for strength.
That said, I love my T8 and prefer the sliding glass doors that can be easily removed and RBI doesn't offer that. I just ordered another T8 and will be sticking with AP for my cages.
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