I personally like that AP cages pre routes a channel in the flooring to fit t-stat probes as I only use flexwatt so my cages can stack or sit flat on the floor without damaging the probe. The only thing I don't like from the looks of the PVCCages is that there is no center brace. From what I have seen, PVC cages that don't use a center brace seem to bow after a few years if they are long. Looks like the builder is using a taller header and litter dam to try and offset this but that makes the door opening/viewing window smaller. Its the same design as my Constrictors NW cage and the smaller door opening because of what I mentioned earlier and the sag are bummers, not to mention the biggest he offers is only 48" long. For a GTP, these look pretty sweet, but for a boa or any terrestrial snake that needs cage length, I don't know.