intrigued... how does this differ from netflix etc? what is the cost other than 9.99 for the box? i cant search for it at the moment as im on a work pc.
Now TV is currently £8.99 a month for 3 months (GroupOn did a deal for 6 months free but I missed out on that, doh !) and then £15 a month.
I don't think you need a Now TV subscription to use the iPlayer facility but they are adding features all the time.
However you can access the developer menu on the box and install 1 application at a time, therefore Plex can be installed.
Once that works and after my 3 months are up I will just cancel the Now TV as apart from very new movies there's nothing else they offer that Netflix doesn't.
edit: To use the box you will need a Now TV account (which is free) and this will give access to non-subscription apps such as iPlayer & 5OD. The free services will work even if you don't have a subscription or if you subscription has lapsed.