i just made the switch myself also and i agree 100%
i will add it is a pain in the butt to have to clean a 20 long you can spot clean for a week or two but after that you have to throw away all the substrate wash all the hides and plants and whatever else is in the cage then take the tank outside and wash all the stuff out that soaked through the substrate all while trying not to get your uth that is on the bottom of the tank wet.
i used 20 long aquariums with good results then i found this forum and saw the cages people here were using so i decided to switch and see how they worked out and i will never go and buy another (fish tank) again. the maintanence and ability to keep proper temps and humidity in pvc cages is beyond words it is so much easier plus on clean up it cuts the work in half if not more.
switching to my ap t3 cages with the herpstat is by far the best thing i have done, and i would like to thank all the fine people here who suggested it.