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Hi David,
I bought the lowest model Kendrick model VI which has 4 ports and I also got a Kendrick 3" heater strap for my 100mm Genesis. It's the best accesssory I've ever bought, period! Works like a dream, but it does sap the power a bit. I hooked an amp meter in line once, and with the controller box set at about medium, which I think means heating 'on' approx 30-40% of the time, current jumps from a basal of 0.2 amps up to 0.5-1.0 amps when it cycles the heater strap. So 4 heaters at once will really sap the power. The higher model Kendrick controllers are all digital and more sophisticated, a lot more $$ and probably suit your needs better - but complete over kill for what I need.
Sorry, I have no comparo data nor experience with any other brand, but my Kendrick basic model does a brilliant job for me. I have no idea why I went without one for so long. Fox.
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