Just rode the TR on its maiden voyage from St. George - Finch - Eglinton.
It was great to see so many transit geeks, TTC higher-ups in pinstripe suits, and Bombardier engineers in plain black tees in one place.
The ride was smooth, noise level reduced (compared to earlier trains). A/C went out a couple times, and as we know there are still huge gaps between the doors and certain station platforms. Also, some of the lighting kept dimming during longer/faster tunnel trips. The doors also take a while to open. I think a lot of taller people felt uncomfortable with the lower ceilings, too.
All in all, they've still got a few kinks to work out, but I think Toronto is in love with the articulated design and the light-up maps.
I overheard that they will be operating the TR on weekdays from 9 am - 9 pm, and will not be used on weekends - at least for the time being.