I signed my parents up for February 8. I couldn't get on earlier at 8:00 because the browsers on my phone were incompatible. Then the registration system showed me a bunch of times and dates that apparently weren't available, so I had to do a trial-and-error effort testing every time before the registration processed. Then when the registration went through, it wasn't clear to me whether the page had just reloaded and the system had screwed up. Not great.
But I'm glad they're signed up now.