I missed most of the first half with technical issues here. Signed on one hour prior, and then got signed off inexplicably and couldn't get back on. Waited for 40 minutes to talk to support on the main number, then was referred to another number and waited another 30 minutes. The feed interrupted when I finally was able to sign on at the end of the first half, then was good for the second half.
I got the sense they had many issues today, but I hope they figured out why they had these problems. The streaming version worked fine last year for me when I was able to get the satellite signal, so I expect this means the subscribers have increased significantly and this was growing pains.
As fnordcircle pointed out above, if you have issues, call (800)670-7288 (your account info will refer you to the main technical support number, which has never been a pleasant experience for me). Also, link to the games through directv.com/sundayticketspecial rather than the Sunday Ticket link on the site (there were problems with that as well). In the end, $100 rather than $300 is a great deal (beggars can't be choosers, and this is the only way I see the game here), and from my past experience when I had the satellite service I recommend it.