A few days I just defended google voice while one of the members complaint about missing calls and slow text messages.
Today I got a taste of what it is like!
Slow, extremely slow text message delivery is the problem today. At times it takes over 30 minutes for the message to arrive. Practically it is not usable at all.
I don't know if this is isolated problem or others experienced the same thing. I work in NYC, by the way.