Darrin,
I'm not sure I understand the whole 2x the time out of a slick vs a DOT. They are the exact same compound, how does 5% being sipes make any difference in tire life? Unless you just choose to wear a slick to the cords and not with the DOT version.
Not saying this wasn't your...
capit is the only brand out with a 3 year warranty....and are waterproof...and use less watts per set
I've been happy with mine so far. I like them better than the CHR warmers they replaced.
I had my set for 3 years...about 50 trackdays when they went bad. I went with Capit this time...they actually have a 3 year warranty and are waterproof.