Animal Plastics Racks with Dual Side Radiant Heat

Does anyone have any experience with dual side radiant heat for racks?

I'm considering getting an Animal plastics 10 level CB70 rack with this type of heating. (Also because it's 10% off).

I currently have a 6 level Animal plastics rack with belly heat, which my balls seem to like.

The extra 10% discount is a good incentive, but if the heating method is not as good as belly heat for balls, then I would rather get the belly heat.

I talked to Allie from AP about this and she says that both would be great. I just want to get anyone's first-hand experience.

Can anyone provide any advice?

I use the ones with back heat. I would think that if the rack has dual side heat, it would not allow one part of the tub to be a "cool end". But, I have never had a rack with that option so I may be wrong.