Belt drive fixed

Been experimenting with belt drives for a while now. Currently rather happy with my Parlee. Have been getting rather obsessive with trying to get this as light as possible without going to crazy on the parts. Currently sitting just under the 4 kilo mark I believe. Happy to answer any questions people have on belt drives! Skidding-wise, I haven't had an issue on my bike as of yet...

http://www.lfgss.com/picture.php?albumid=2181&pictureid=16572

The only real question is "why would you use Speedplay Frogs?"