4K TVs are getting more and more popular, and smart TVs are at the point where it's almost impossible to buy a new screen without some kind of fancy integrated user interface and streaming video apps. Instead of opting for Android TV like on previous models, TCL's new C1 curved (or flat) 'QUHD' 4K TV has a smart TV system built on Linux, and it's half the price of equivalent size displays from Samsung, Sony and LG. But is it worth the asking price?