As promised, here is the first picture of our new Co-Motion Mocha with S&S couplings. Sorry picture shows no technical detaills, but a great view. It is a stock bike plus a Thudbuster suspension seat post and an Avid drag brake controled by the stoker with a standard brake lever.
Picture is taken on the warf of Pasaje San Pedro, the waterway into the port of Pasajes, just west of San Sebastian, Spain. Bike rides very well, you can see a happy stoker. Granny gear is 28x34, which sounded awfully low to me, but here on these hills we have used it enough. You can't go anywhere around here without a good hills.
I have now built up the bike twice and packed it once, I was surprised by how much work it is to pack and unpack the bike, I have reasonable mechanic abilities, but it takes a while (over an hour, closer to two) and some skill, I would not recomend a coupled bike to a novice mechanic, unless you can receive a hands on tutorial. Bike came with a Co-Motion video which shows very little datail of the process.
We have gone on local rides so far, with either wife or daughter stoking, max 35 Km climbing to 400 meters. Not too far from where the Tour de France will ride through Navarra in the Pirineos, but too far to go there and back in a day. I have my eyes set on some longer and higher rides, but cycling competes with family, food, and beach, and stokers are not very happy on the climbs.