yea meg,i had a feeling thats where you got it.i think thats weird because im sure i found a reccomondation somewhere on his site(im gonna have to look)but based on what greg said,i have to agree with him.the original poster of this topic,when describing his setup,provided the heated perches in such a way that if the snake wanted to be perched(and chondros always want to be)he would have to accept the heated perch because there were no other options available.setups like this i think are what greg had in mind when he made that statement and im sure you as well,but the type im in favor of are a combination of both heated and non heated.its also good to have the heated perch the highest one as in nature chondros usually seek out the higher perches when looking for heat.the idea is that under the forrest canopy,there is little heat but once you go higher and break through some of the shade,you will find more heat.besides that,heat rises so its just natural for them to go up to seek warmth and go down to seek cool.i think if used incorrectly,they may be no better or safer than the infamous hotrocks responsible for cooking many iguanas and monitor lizards,but used as an option,and not as a primary source of heat,they work well.i think the best way to tell is give as many options to your snake as possible in regards to temps,perch placement,ect.if your snake has many options you can judge for yourself exactly what your snake wants and needs.after all,we can only guess what our snakes want,its them that know best.without providing a mix,its very misleading.lets supposed you have only 2 perches and both are heated.one can say,my snake loves the heated perches because i never see him not being perched.well,that could mean several things.it can mean that he just likes to be perched regardless of the temp,or maybe there is no other heat source and hes accepting heated perches because its the only way of being warm.if you supply a few options,its a lot easier to tell what your snakes like.my perches dont get very warm at all.its the airinside the tube that heats up and that heats the pipe.i have heard of people running heat cable through pvc,sealing it one end with silicon and filling the pipe with water,then plugging the other end.this is supposed to heat the perch very evenly and prevent "hot spots".this may work but i wont go through the extra trouble as mine seem to be heated evenly enough.besides,im sure heat cable is waterproof,but im not 100 percent sure how the water may effect the insulation in the long run.