Another update that basically just confirms things already known:
Had the in-laws over for a couple stints over the holidays. They don't eat much beef in particular anymore due to their teeth (or mostly lack thereof) situation.
So I did a simple 30 hour flank steak roast the first go around. Super tender, pre-seared with Searzall of course, and then finished and served with a simple compound butter and some sides.
[We of course hauled them off to the Henry Ford Museum, have two grandsons for them, and had first and last crack at this holiday season of one-upmanship. In between visits, the wife's sister and her man took them to the DIA, shelled out for a tenderloin (I'm guessing center-cut) but just have one granddaughter for them. So yeah. /hip-thrust]
So for the second go round had some thick NY strips and set theirs in for 10 hours. Boom!
Also, they mentioned the flank steak was as tender, if not more so, than the tenderloin. Wife's dad was planning to play with his Raspberry Pi and work on rigging up his own controller just because he was so impressed with the whole idea (and liked being able to actually enjoy a nice steak again).
Definitely need a vacuum sealer for some of the cuts I want cooking longer now. And a mini fridge for dry aging my own. Yeah.
I got the crazy look again from the wife.