The Fire TV is an excellent set-top box which is powerful and well designed. The voice search works well too, and Alexa is coming, which will make it far better. The interface is slick and easy to use, even if it can be confusing working out what you can watch on an Amazon Prime subscription. The Fire TV is one of the best video streamers, but it really makes sense if you pair it with a Prime Instant Video subscription and use Amazon's other services. 4K content at no extra cost is a huge bonus but don't forget that many 4K TVs already have the Prime Instant Video app. This means it's going to appeal to people who want 4K Prime Instant Video (or Netflix) but their TV doesn't have it. If that's you, just double-check your TV has an HDMI port which supports HDCP 2.2, otherwise you'll find 4K videos won't play.