The only problem I've encountered with the Evnroll Putter is the grooves will collect sand which creates another step in your putting...make sure you don't have sand in the grooves!!
I live in the Houston area and we have our share of the heat and humidity. A lot of the guys here including me put talcum powder or baby powder in the glove before you play to help eliminate the moisture.
I have gone to Tony Allen, PGA 'Class A' Assistant Golf Professional with 20 years teaching experience. He is good about not trying to tear you down and start all over. Several of the members at Willow Fork CC which is my club have got lessons from Tony. I got my lessons from Tony at Meadow Brook Farms and he has a website.