NOW TV Box - 3 Months Entertainment Bundle (BOX + Code)
Stream online content to your TV
Built-in WiFi & Ethernet
BBC iPlayer & ITV Player & All 4 & My5
Access content on NOW TV
3 month Entertainment Pass
No you can't put Kodi on it..
Yes you can side load one app at a time, and yes you can watch movies from the side USB drive via a sideload app.
Yes you can use Plex