I've never heard a positive report on kevlar belts for everyday use . Good luck .
I'll be the first then.
I have no negative things to say about kevlar belts. For me, the Malossi X Kevlar have behaved just like the regular belt, cold or hot and also when it get worn, even though both times i have run kevlar i have used it for over 6000 km, without it failing or being the critical 1,5mm less wide.
The reason why i use kevlar belts?
The one sold by my dealer is a bit longer than stock, and it gives higher top gearing, but others here repport that you can get that gearing by other means too.
So on a standart scooter, its not really either bad or good to use a kevlar belt... But its cool to say "My belt is made of the same material as a bullet-proof vest"