Richmond Court Restaurant is simply one of those places you go to because you know it's open. It's not 24 hours, but who in York Region would still be out past midnight? If you really are, the Richmond Hill branch opens till 2:45am everyday. :)
The Markham branch is quite tucked into the parking lot, especially considering the entrance on Bur Oak if you're driving. The restaurant itself is unsurprisingly smaller than the one in Richmond Hill, and quieter as well. Menus are pretty much all the same though, give or take some chef specials.
I had the beef brisket noodle soup, which is usually what I order in the Richmond Hill branch as well. It tasted okay, the one here was much more bland than Richmond Hill, but I did feel the one in Richmond Hill to be too oily in the first place. Of course it's not authentic, but it does get a little tiring to go to Pa Pa Chang or Mei Nung all the time for authentic Taiwanese noodles.
Service is typical HK style cafe type of laissez-faire DIY kind. Don't expect good treatment here.
Richmond Court's Markham branch is a good option for those in the north or east end of the city. There's a lot more options as you head south or west though.