One problem with all these bikes (I own a Wilier Cento 1 Hy, as does my wife) is the question of longevity of the main battery, and how to deal with that (add the external battery?). I have put 6400 km into my Wilier (which I love, it can do 32 km/h assistance in Canada), my wife has 3200. All in one year. Her battery still shows full range (about 100 km), mine shows about 80km, but on my last ride the power collapsed while still showing 25%, which meant that I only got 50 km. So I am looking into the external battery option, and it is expensive (although I am told by my local dealer that he was able to get and sell these external batteries at CDN $ 1,000 a piece). So I am looking into aftermarket options, the main obstacle being the 4-pin connectors. The batteries seem to be available at a few-hundred dollars, but the proprietary connector is the problem, and possibly the battery management system, i.e., just plugging some replacement battery may not suffice. I do have enough know-how to not be afraid of simply plugging in a battery - my sense is that the controlling electronics is already part of the bike - but it would be interesting to hear about such experiences!