Last summer I installed a JCosta variator on my 500 and was thrilled with the dramatic increase in performance and smoothness of acceleration. Of the dozen or so mods I've made, this is by far the best.
At the 6000 mile service, my dealer discovered a crack in the cover and re-installed the original Piaggio variator. I emailed JCosta and Xavier was a pleasure to deal with. He wrote back immediatly and sent me a replacement cover via airmail from Spain. I got it in today's mail and can't wait to have it put back on the scoot.
Fantastic product with truly outstanding customer service. JCosta rules!