I started watching on HBOGo around 9:30 and it streamed perfectly, I even hooked up my laptop to the TV so I could watch on the big screen. Stayed in HD the whole time with no buffering.
Very different from the Game of Thrones streaming experience:
9:00 Log in
9:04 Start refreshing page
9:05 Episode becomes available, click "Play Title"
9:10 After period of buffering, credits begin to play choppily in 240p
9:17 Episode stops, loading wheel spins around for a while
9:20 Show resumes in 360p
9:29 Second loading wheel intermission
9:50 Show reaches 480p, last scene may or may not reach 720p
10:05 Ask myself why I can't just wait until Monday to watch this show