Argo Navis + 10k encoders have worked impressively accurately on my 2015 15" Classic. I regularly aquire targets within the 100° afov at 240x... no need to change down magnification to aquire a new target.
First -- glad to see this offer to see a 22UC - just wish it was 'post covid' - and a lot closer to me - since I've never seen a UC22 'in the wild'! However, my advice over the years has always been 'go to a big star party and check out the Dobs you are interested in' as better than reading any reviews. Until you've set up an Obsession 36 and climbed up that big ladder in the dark - you have no idea......
I've owned a DSC equipped Obsession 20 F/5 for like 18 years - and have used friends' Obsessions for years before. I also own an old Mountain Instruments MI-250 'PushTo' GEM with the same setup. Nearly all 'DSC fails' I've seen over the years ( including my own ) have resulted from a few easy-to-fix issues - the biggest being slipping encoders, something (shroud?, etc) pulling on the encoder, wrong setting in the unit, bad cables. I've never experienced an actual faulty encoder or DSC unit. Mine work 99% of the time - or more often.
The StellarCat systems that I've seen work very well - except when they don't - which is rare. The biggest 'negative' (beyond price and the install work) for me - living in the weedy East - is the issue with weeds and grass getting caught in the az drive - which will quickly destroy the precision ground board. I have one friend who always brings a gas-powered weedwhacker on his observing trips - to 'destroy' the weeds and grass on the spot his scope is going on. I've also seen people with plastic ground covers with small holes for the telescope 'feet' to go thru - all aimed at keeping weeds/grass out of the az drive.
One year at Stellafane a guy showed up at 6 PM on Friday with an Obsession 18UC --- still in the un-opened shipping boxes!! He was looking for set-up help. I ran for the food tent - but 2 or 3 brave souls opened the boxes and went to work - racing to beat the failing light - under a clear and beautiful sky. The only real 'issue' they had was - the StellarCat slewed/tracked backwards! A walk to one of the few spots there with decent cell service and a quick call to the maker of StellarCat resulted in finding some setting was reversed - and within a minute or two - the 'Cat' was slewing and tracking just fine. While I never did get over to look thru it people I consider advanced observers reported fine views.