Just signed up and it was pretty straightforward. I did notice one quirk, though: on the old site, I have a pending gas station charge of $1 (whereas the new site correctly shows the actual amount filled).
Anyway, I probably wouldn't have signed up if it weren't for it soon being made mandatory considering DC is my only banking relationship with BMO Harris. At least it shows they're probably not going to cancel the DC product(s) any time soon?
(On that note, I wonder if they're going to pivot DC to more of a "higher end" product for their banking clients, kinda like how the Altitude Reserve requires a preexisting US Bank relationship to apply. Requiring the consumer cards to use the same banking interface as for their checking, etc. accounts would be a needed step towards that.)