Experienced quite a number "cheating" up Mount Ventoux a few weeks ago and zipping around the hills of Provence. Likewise loads at it up Col de L'Iseron last week and on nearby mountain bike trails above Tignes. Did Col de la Madeleine today and I'm pleased to report that there were only "real" cyclists on the road. Seems to depend on prevalence of local bike shops renting these battery assisted bikes out, ie. Not many seem to actually own them yet.