I have two of the CB-70 racks and i love them, the heat is plenty, not only does it warm a good area of the bottom but if you open the drawer slightly and reach your hand in you can also feel that the air is warm.

My snakes are also alot calmer and have even better feeding responses in these racks, i think that the consistant, steady heat and secure feeling they get is the reason why.

I looooove these racks.