Love my DR680 mkii: able to run my UA-5s to it easily and very easy to operate. Never had a problem. Some draw backs to it, but they were more peevish than anything. Considered a DR701d for a while. Form factor mainly.
Might switch things up later this year. Leaning toward SDevices. The USBPre has been turning me on for at home/on the fly use and wanting to record bird songs has me thinking more about a MixPre3. Form factor alone has always been in the back of my mind when it comes to making my main deck a MixPre6. The DR680 is really big (statement made in the year 2021, I know I know). Footprint in these NOLA venues is definitely a thing.
680mkii was my step into flying mics and not looking so newbish. It will be missed as it was a hell of a deck... for a Tascam.