i use KLS pro
i found that i didnt suffer from cold shear any more and tyres lasted longer, also it was easyer to read the tyres as it was only the suspension causing them to rip up.
Kls use a carbon heating element which stops localised heat or hot/cold spots, but more importantly they have a 2 stage heating selector so you can leave them on all day at 60 Deg and have no damage to the tyre, as you shouldnt leave them at 80 Deg all day....
http://www.kls.de/index-eng.htm