OK, so I test-rode the DS and the FXS today. I fully intended to like the DS, but I did not completely. The seat is terrible for me: very hard and with some sort of edges on the side that are in the wrong place for my bottom. I was uncomfortable after a short demo ride. Towards the end of the ride I experimented sitting at the rear seat, and actually felt great from there: higher and a more natural position, rather than the upright and slightly slouched position before. The seating position is also almost too upright, have to keep myself in place rather than lean slightly on the handlebars. That also causes slouching, a problem I have with my current scooter because the handlebars are too close to me and the seat too low for me. And I know that gets really uncomfortable after 30 minutes or so. Maybe lower or more forward position of the handlebars would cure that. Not terrible, but with wind hitting me in the chest, I think I would have preferred a bit of a forward lean.
Second, the heavy and large front wheel/tire combination made the bike very "unflickable". Probably great for straight-line point to point type of riding, but I did not like that heavy steering input needed. I remember from riding the S/SR in 2014 that they were just about "perfect" balance between stability and cornering.
I tried the FXS for a few minutes too. I wish I had tried it for longer. So much fun! I wonder if there is a thing like "too clickable" - it steers about as easy if not easier as my scooter. If it had at least 9KW battery I would buy that. The seat is also a lot more comfortable for me, probably because it is contoured differently (does not seem softer and if anything has less padding than the DS seat). yup, the handlebars are even closer and the riding position is also upright, but the fun factor might compensate :-)
In terms of power, the DS at full power was not an issue, meaning it had more than enough for sane riding, but I would not mind having a bit more for the rare occasion I might want it (but not need it, I think). Eco mode was not enough on dry roads, Sport was just right :-). Interestingly, Eco mode on the FXS felt stronger than on the DS and Sport was even better, he-he...
Unfortunately, there was no S/SR available to test-ride. Based on what I felt today for the DS, I don't think I want a bike like that - too steady (the seat can be fixed). And the battery on the FX/FXS is too small so it won't handle some of my commuting options. So, I'm left with S or SR to try again and decide if I go with one of them or keep my Vectrix until Zero gets a bigger pack in the FXS...