Have to say I've been sceptical about HDTV until I recently got a glimpse of a HDTV in the US; it was impressive, but I didn't have time to investigate it.
More recently, I was in John Lewis in Kingston and they were running an HDTV from an HD DVD and on close inspection I have to say the picture quality was STUNNING - I've never seen anything like it; pin sharp, fantastic detail, beautiful colour and contrast etc. Now, I know a thing or two about this area - I worked in the film industry recording film soundtrack music at the top studios for more than a year or two, so I've always been a bit stuffy about quality to put it mildly. [:(]
Believe me, HDTV is capable of astonishing quality but remember, the picture will only EVER be as good as the quality of the original source material, AND the uncompromised quality of the transmission chain/medium from aerial socket or DVD through to the very end of the cable-socket going into the back of your shiny new HDTV - get that right and you'll be astonished at the quality.[:0]
The only other rub really is price - my advice? wait for the prices to come down while the early adopters pay for the innovation

, and in the not too distant future the pricing will look sensible. Also, you're going to have wait a while anyway while the content producers gear up to put out the majority of their programming in HD - but when they do, pour yourself a G&T, kick back and prepare to be amazed...[8D]