I use a Technikardan 23S for medium format film work in B&W, and it's a pretty good camera for that -at least, I like it a lot now that I have it set up and modified to suit my way of working. I'm not sure it's all that suitable for digital, though. In particular the rear standard has a tendency to flex a bit (I stop it moving with little rubber wedges when I need to), and the design of the support 'L' means that you can't fit a sliding back. If you did use a TK for digital, I think you would want one of the new Phase One backs with live(ish) view for focus checking. If you can afford one of those you might as well buy an Alpa or Arca to put it on - it's almost petty cash by comparison.
The Techno, however, does look pretty good, and I suspect is underrated. Those few people I've talked to who have used one seem to think it is well up to the job.
Do bear in mind that the smaller field cameras are in many ways more difficult to use than bigger ones - in particular they are more difficult to focus, because it is more critical. The naked Mk 1 human eyeball is not always up to the job - hence my TK has an Arca binocular viewer fitted and a depth-of-field indicator on the focusing knob. It's a bit of a pain without those mods, but very good with them.
For MF digital use I'd really recommend a pancake shift camera with helical focusing of some kind. That's probably why you can buy cheap used TKs now...