I use them for my bps. I think they’re pretty good. Extremely light weight and affordable You’ll need to keep in mind that it’s not a solid panel of PVC. It’s 1/4in PVC sheets slotted into an aluminum frame. I’d definitely recommend sealing the bottom with silicone. One other downside is that it’s a screen lid as well. You’ll need to cover it with something to keep humidity in. Other than that, I’d say it’s a very good bang for your buck deal.
I bought two of the 4x2x2 for my beardied dragons. Assembly is easy, pretty darn sturdy once they’re together (I do NOT want to try and pull these apart ever), and with silicone sealing are water proof enough for naturalistic/bioactive. I just ordered the 1" stackers, and the support pieces between the tanks (as both are going to be naturalistic). I’ll post pics of when they are together. I also plan on getting more of these for my reptile room and moving everyone into their own.