Thought I’d start this thread for people to talk about their first impressions of the DT (use other thread for bug reports)
For historical purposes OS is V1.02 so if you are reading this in the future bear this in mnd.
Heres mine:
Build quality - very nice, feels as good as its bigger older stablemates.
Features - A nice balance between simplicity and possibilities
Design - I like the look of it
Sound quality - No complaints, sounds clear and full
Reverb and Delay, both the sound and parameter choices allow a fairly wide range of delays/verbs, possibly the delay could be tweaked a little in the sub ms range to allow comb filtering etc
Interface - Mostly very direct and simple, although there is a little room for improvement WRT navigation in the file system, I wish it was more like the OT than the Rytm. Also there are a few head scratching moments when in certain nested menus, the older machines (silvers) never had these issues, so we know it is possible for Elektron to make very clear nested menus, so hope it gets looked at.
Sample editor - I am a big fan of the OT audio editor, and the DT is similar, albeit it does not do anything other than simple but well executed trimming , the zoom function is intuitive and fast, to my mind the encoder response could be tweaked a little but other than that it works nicely. I love the fact that you can sample in upto 33 seconds and derive many samples without fuss. The auto normalisation can seem a bit unpredictable at times, sometimes things come out very loud other times not.
Bit reduction and Overdrive - Hmm, I feel these are in need of expansion/addition because they sound very distinctive and may end up painting the DT into a corner. They sound ok but a bit more variation or the ability to swap them out would be my preference, the bit reduction in particular has not much finesse either slight, crushed or destroyed! A good idea might be to have bit reduction ccw up to halfway, then sample rate reduction halfway to fully cw. The overdrive might also benefit from a similar tweak, wavefolding on one side then what we have on the other side, in both cases mid position is none.
Filter and envelopes - Really good from the get go, the envelopes have a very natural sound and the adjustments are predictable and precise. The filter is sounding simple and nice, with a fair amount of flexibility, notch, peak and bp would be welcomed though 
Thats it for now, I will add some more later, and feel free to add your own, agree disagree or mods move the thread if required. (I did have a look to see if a similar thread existed but on the phone so may have missed it)
More:
No arranger/song mode - Not bothered, never really use them anyway but something to be aware of, also it signals a movement in the culture of electronic music performance, which I have long been a proponent and fan of, there are plenty of other machines with song mode anyway, the DT is more performance related - embrace and enjoy, let your hair down and flow in the living moment 
Bug/issues - Most of the user demos and tutorials fail to mention the bugs, as of 1.02 there are still issues which need to be fixed, rest assured Elektron will fix them, but if you are impatient best to wait than be frustrated, see the bugs threads for info. I will add that you can still do a lot and have a lot if fun, stability as a standalone is pretty ok, although not perfect.
Screen/graphics - Nice and clear, some slight ghosting, some slight room for graphical tweaks but a nice improvement from the older products in terms of visibility and clarity.
Buttons and encoders - Great feeling, the buttons are a little noisy mechanically due to their increased depth but not that much more than previous products, the encoders feel very similar to the black machines.
VS OT - The OT is a wolf, wild and very powerful, and not so easy to tame, the DT is a puppy, easy to tame although it might pee on the carpet from time to time, and not a poweful beast, though still very capable and perhaps more fun in a simple way. Puppies can grow into powerful dogs, and they can always surprise.
Sampling - Hmm, very direct, simple and hassle free, BUT no level control can be a PITA as it means you have to adjust the level at the source, needs fixing. However the sampling into ram and the ability to go back as many times as necessary to pull sounds from the recording is a joy for sampling sessions, yes you can do it on the OT too but the DT makes the flow a bit faster with less menu diving. Threshold sampling is something I have been asking Elektron for since the OT beta, so very happy to see it here. But don’t rest on your laurels Elektron because sample on midi start and sample until x would be nice too
File system - Feels a bit clunky, I have not spent too much time exploring it yet, but seems very similar to AR which I never use because it is so tedious, why the +drive can’t be like the OT filesystem with folders, and simple navigation, maybe I need to get to grips with it, but the OT file system was obvious and simple right from the start.
Overall - Very happy with it, it is a bit like a Volca Sample (one of my favourite instruments) in that it is very easy and fun to use, of course it has more capacity, better build quality, and of course the great Elektron sequencer.
Bonus Round:
Talking of the sequencer on the conditional trigs I’d prefer the option to decide if you want %age or x/x first, as I rarely use % and scrolling all the way through can be a ball ache. Otherwise though I’m as happy with the sequencer on the DT as the AR\A4 (which also have that) and it is nice to see that it was not nerfed in anyway other than the lack of arranger/song mode, which is fine by me.
Overbridge - No comment/Couldn’t care less, making music should be fun, that is why I only use hardware Although glad that I did not have to pay extra for something I will never use.
Be Aware - As of yet no options exist for getting samples off the machine, the transfer app currently is only from computer to DT at present, also you may have to fiddle a bit to get it working (restarts, unplugging cycles) I believe these will be addressed in future updates though.
It is more fun to enjoy what the DT offers than being dissapointed about what it doesnt offer.