Sky launched its high-definition television service on Monday, meaning its viewers join Telewest cable customers in watching TV in a new way.
With the BBC formally beginning its own HDTV broadcasts on Saturday, four readers give their impressions of the new service.
Jeff Newton: "The picture quality is outstanding."
Having been one of the lucky few to have Sky HD installed this week, I've had five days to form my own opinions of the latest technology in TV.
There is absolutely no doubt that the picture quality is outstanding.
There has been lots of talk about whether it is important to be able to see the sweat on an actor's face. It's not.
It is, however, fantastic to see the detail and colours of nature in the latest Discovery HD programme or see one of your favourite movies in screen quality that you have never seen before.
I think possibly the best way to explain the difference between standard TV and HDTV is to remember VHS against DVD.
Could you go back to VHS from your DVD? No, and I think it's fair to say that I won't be going back to standard TV.
Austin Grant: "There will be no going back."
After the Sky engineer left on Monday, I had a quick scan through the HD channels - the picture quality is superb.
The first thing I noticed was picture clarity, detail and sharpness, the colours really stand out. And you are blown away with the feeling of depth perception.
It is amazing how quickly you get use to the HD quality, and end up not watching the normal channels as they look blurry in comparison.
Looking forward to watching the Planet Earth series starting on the BBC HD channel and also the World Cup.
You need to experience the viewing to understand what all the fuss is about. Once you do, there will be no going back.
Rob: "Standard definition is like watching TV through clingfilm."
I've watched several broadcasts in HD including the 5-day international cricket match, the England football friendly and the HD previews on BBC HD.
The most obvious differences between standard definition and HD is the detail and the vibrancy of colour. Watching standard definition is like watching TV through clingfilm.
Simple things, like looking at the grass on the football pitch, the whiskers on a man's beard; the fine detail is amazing, it's like you're there.
Rahul: "The hype is worthy."
Firstly, the hype is worthy. Some of the broadcasts I have seen have been breathtaking, especially the natural history programmes.
Star Wars Episode III on Sky HD Box Office was undoubtedly far superior to my DVD copy, though that might change with HD DVD and Blu-Ray due out soon.
To many HDTV is all about sport and the live cricket coverage speaks for itself. Absolutely amazing, I could read the wording on the players' shirts and see faces in the crowd.
Even more reason, I think, to eagerly await the BBC's coverage of the World Cup.
If I had to find fault with the HDTV revolution, then it's probably the current lack of actual HD content. But in time I believe this will change, and HDTV will become the norm.
What next? Well the engineer from Sky, who installed my system, hinted at 3D HDTV - now that would be something!