Riding a NC700X-DCT for 4 yours and have recently bought an AT with ABS and DCT. Not that I was unhappy with the NC700, but mainly because the AT suits me better w.r.t my length of 1.90m. Knies were hurting on the NC700 after 1-2 hours, but this may also be a 'luxery' problem of course. Very happy with the DCT and never had a single problem with the bike (and DCT).
There was a question on possible higher service costs of the DCT, but it is only the 2nd oil filter for the DCT, the same oil is used for the engine and DCT. Oil filter change every 12,000km.
You have to get used to the DCT and although Honda made software improvements with the NC750 and the AT, the main characteristics remain unchanged.
I got used to the following DCT use. In the city I use the manual mode with up- and down shifting with the 2 flippers on the left handlebar. In auto mode, especially the D (touring) mode, the system changes gear too frequently. Outside town I use the D mode, but only when the area is flat like in The Netherlands. In hill/ mountain areas I use the S (sport) mode and/ or manual mode.
In D mode the DCT up shifts around 2500rpm and down shifts around 1500rpm. In S mode shifting levels are 500-1000rpm higher. Software mods made by Honda for the NC750 where mainly an slight increase in shifting levels for the D mode. But now a nice DCT trick comes into play. The moment of upshifting is depending on how far you open the throttle. In D mode when you drive relaxed upshifting is done at 2500rpm. When you open the throttle half way, up shifting moves up by 500-1000rpm, whereas when you give full throttle, upshifting can take place at 4000-5000rpm.
Also to mention is that you can always manually down shift, also in auto mode. This is a very handy feature, because in D mode the engine hardly brakes when you close the throttle. When approaching a turn I downshift manually to break, open the throttle to make the turn and the DCT does the rest again.
It is not allowed here (and some other N.W.European countries) to ride offroad except on special tracks, hence I have never used my NC700 and most likely will not use the AT for offroad. I am almost sure that the D mode is not suitable for offroad because of the very low rpm range in which the engine will be running. The AT has three S modes, S1, S2 and S3, with different up- and down shifting levels. These will be meant for offroad.
I always have found on my NC700X the difference between D and S mode a bit too big. D mode too low rpm and S mode too high rpm. The NC750 should be better in this respect, but the AT probably will have it all. D mode for relaxed cruising on the road, S1 - S2- S3 for other 'road works' and offroad.
May be a long story, but this will give actual user experience for DCT newbies.