I have one RBI 2'x3'x12" and am adding a second.
I like the fact that it came fully assembled with the LEDs installed (although they do have an on/off switch, I wish they had a dimmer). The packaging was amazing, but still the carrier managed to damage one side panel. I emailed Reptile Basics and their customer service could not have been better. They asked if I was comfortable replacing the side panel myself (I was) and two days later both left and right side panels (even though I only needed the right) arrived with new screws and the square head bit I would need. They also refunded $25 for my trouble even though it clearly was not their fault.
The routing for the UTH and UTH probe was great. I wasn't completely comfortable with the tape they provide to secure their UTH so I did add Gorilla Tape around the edge of the UTH.
I also wasn't comfortable with the stainless screws they provided to secure the RHP, so I picked up stainless bolts and nyloc nuts instead.
My only criticism after having the RBI for a few months is that the finish on the cuts, especially around the door, was rough. A little sand paper took care of that problem.
Would I prefer glass to plexiglass? Absolutely. But am I willing to wait 4 months for it. Nope.