Dahon in EU seems to have stopped importing models with double chainrings. They've since removed all of the older models from their website. I was just about to order the Visc D18 for 700 € but the last one sold out last week in all of the bordering countries. I found 2 units remaining of the 2014-2016 Vector P20 in different online shops for 1000 €, and was thinking about traveling a couple hours to one of the shops to look at it. I wanted to bring components to swap out while I'm there though, if I decide to buy it and try to get a discount for leaving some of the parts there.

Does anyone know if the Vector P20 has a 130mm or 135mm rear dropout?
I want to avoid ordering the wrong size crankset.

Not sure what the 300 € difference is between the Vector and Visc. Possibly a newer frame design? The 10 speed components would only cost about 50€ more than the 9 speed components. The Vigor D9 appears to have almost exactly the same frame as the Vector and it goes for 700 €. Changing this to 20 speed might be an extra 150€.