Mmm. I overheard a salesman in a large high street electical chain telling a prospective customer that the major difference between Plasma and LCD was the life of the unit, intrigued I moved closer and heard him state that a Plasma would be good for about five years and an LCD maybe eight! I was shocked. I have a Sony Bravia HD LCD which I bought 'on the crest of the wave' and thus paid a small fortune for it I would hope to get more than 8 years out of it. My old Sony Black Trinitron was bought in 1990 and it is still going strong.
The salesman also told his customer that when the Plasma started to show signs of deterioration they could be 'refilled'?