Experience with heat mats?

[allergenic]

I was wondering if anyone had any experience with using commercially produced heat mats inside their custom ball enclosures.

I don't particularly like Flex Watt due to the fire hazard possibilities, and am not a baller so I don't want to shell out ~$85 per mat for Kane heat mats. Cobra makes one, as do some other brands.

Do these work alright? Easy to clean? Anyone use something like this before?

Thanks,
Bill