Why not just use an Apple TV? Maybe you don’t have Mountain Lion on your Mac and can’t share your display over AirPlay with your TV. Maybe you got a PC in the house too and want to stream video from that as well. There are lots of reasons, but basically, Plair is more universal than a lot of options out there.
The Plair doesn’t have as many cool features as an Apple TV or Roku. There’s no Netflix or Hulu built into the dongle, but you can still stream those services from your computer to your TV.
Plair’s dongle will costs $99 once it’s launched in Q2 of 2013. It connects to your TV’s HDMI port and will stream any video from your Mac, PC, iPhone, or Android onto your big screen. Just download the Plair app and go to work. You can stream video to your iPhone too with the Plair app, but because of licensing issues, there are only a certain number of shows that are streamable.