Have been using an Apple TV for our main source of tv for several years now. All the main apps are there (bbc, itv, channel 4, channel 5, now tv, Disney, prime, Netflix etc).
It works particularly well if you have other Apple devices, you can use phone or iPad as a remote, AirPlay to it etc.
I changed to it because our aerial was a bit useless, and the apps built into the tv were laggy and became unsupported as the tv aged.