I think I may pull the trigger on a '22 MM R18TC as early as tomorrow if we can work the numbers...
In all honesty, not my kind of bike but I wanted to try something new after 5 GSA and 4 Goldwings and 2 K1600 and 4 RT models...
Let's see what kind of pleasure this beast will offer?
Take her out for an extended test ride first and be sure you can fall in love with the bike first. I'm obviously very biased, but I also hate seeing people buy something, only for "irreconcilable differences" to appear. If you do choose to watch YouTube review videos, keep in mind that this is only BMW's second foray into the cruiser market, thusly reviewers almost reflexively s*it talk the R18 over HD and Indian cruisers because it's so different for them.

Motorcycle review articles/videos trashing the R18 in a nutshell...
Alcina (my R18 TC), is, IMHO, one of BMW's most gorgeous motorcycle's they've ever built (I can say that about the ENTIRE R18 line), but, as a TC, she has all the bells and whistles suitable for a...transcontinental trip (I think you'll enjoy the adaptive cruise control).
All said, you do you. I'm HEAVILY biased, but I do encourage you to do another ride before you talk any numbers, just to see if you truly want to jump in.
Hopefully you do bite the bullet. But, if you don't, then no worries either! Rather you make up your mind now than regret your decision post-purchase.
Mike