Hi
I drive my kalkhoff endeavour with Gates belt since a week. I bought it for my daily travel from home to work (27km each way). I chose the belt drive because it's maintenance-free. After a few hundred km's I can say it's a great thing, in combination with the Shimano alfine.
It's only a petty that legislation in Belgium is not up-to-date with reality: speed pedelecs are sold, but for the law they are considered to be a motorcycle (helmet, licence plate, insurance etc etc ...). In reality: nobody does this and drives it as a normal bike (including myself).