Yup, I took it on the first day of service, last Weds 11 June, or rather I intended to -- I showed up just in time for the train scheduled for 3:55pm (after two Metro transfers -- why did I think that Krasnye Vorota was on the circle line?!?), only to find out that half of the trains that day were cancelled due to the prior day's accident. I would have been royally screwed except for the regular nonstop service to Lobnya leaving five minutes later...

Anyway, it does seem as if the opening was prematurely rushed. Hopefully they will sort out their issues in short order, publish an accurate schedule on their website, and build up capacity over time...