Plugging in Battlefield 4 first was the right decision. 60 frames-per-second, that sharp resolution. When you get to the first wide open field it's like heaven.
Second best decision was downloading Resogun. What an awesome, basic shooter to show off the hardware's lighting and sound engine. The online co-op mode was quick and found someone in less than a minute. A great time waster.
The UI is great. Fast, responsive, intuitive. Able to hop in and out of software and the dashboard without any hiccups. Also, installs are fast as hell.
Besides the obvious PSN hiccups (PS Plus not recognized at all by the Store so far) and the near three hour system update + Battlefield 4 downloads, it's been smooth sailing so far.