I've had my prime since Mid May No problems, the wifi (locations) can be a little off, but nothing to major.
I use it for laying on the couch, tweeting while watching TV, watching movies/media on flights. I use it more for travel and entertainment.
I've had no issues and I'm even thinking of upgrading to the new prime when that comes out!
But I need to see how Jellybean works on my prime first.