I always make sure that the ambient temp is warm but honestly ive never tried the heat pad, maybe ill have to try one out. I have not seen the turbo cloners but I assume that its just like the expensive aeroponic cloners? Ive made my own cloner out of a bucket and a pump and some pvc and had alright results, but I found it to be way too much work to get around a 70% success rate. Does the heat pad speed up the rooting time? Right now I get roots in around 10 days so I cant imagine it could get much faster than that.I do feel heat from underneath is quite important but 100% agree otherwise with your statement, just out of curiosity have you seen the turbo cloners?