I've put around 12k miles on my NC700X/w DCT bike since I bought it in Dec 2014. It had been mostly my "in-town" bike up until this past summer when I started to take it on a few longer, multi-day rides. As far as I'm concerned, not having a clutch to help modulate takeoff from a stop is still somewhat negative but I'm getting better with it all the time.
With a manual clutch you can feel the "friction zone" as you feed out the clutch lever gradually and if it starts to go too quickly, you can pull back the lever. With the DCT you don't have that so it seems as if there is no movement at all, then it starts to GO! You can modulate this by dragging the rear brake but I've yet to master that. One thing that affects perceptions of the DCT is having an open mind about different technology. I've never owned a scooter so all my bikes, off-road and on-road, have had a manual clutch. This gave me no prior experience to tap so I just looked at each initial ride as a learning experience, without viewing it negatively.
In all the other situations, using full automatic (D or S mode) or doing it manually, it works great. I'm in D all the time, and manually downshift a few gears before a slow speed turn. The shift computer is setup to maximize fuel economy so it won't downshift from 6th-to-5th until you're almost at a walking speed, then rounding the corner you give it throttle and it'll downshift 2 times before accelerating and upshifting. It just feels too jerky this way so I've found it much better to round the corner in 3rd, then the trans doesn't have to downshift. In D, the normal upshift is at 2000 RPM and it does seem weird at first but my mileage has been in the mid-60s to low-70s so not twisting the engine faster certainly saves fuel!
Overall, I like it and would certainly consider buying another bike with DCT.