I recently tried a few when in Bordeaux doing some wine tasting:
Chateau Le Conseillante, Pomerol, 2006 - V good
Clos Fourtet, St. Emillion, 2004 - Good
Chateau Palmer, Margaux, 2004 - V good
Chateau La Mission Haut-Brion, Pessac-Leognan, 2004 - V good
Chateau Lynch-Bages, Pauillac, 2004 - My favourite of the lot
Chateau Lafite-Rothschild 2004 - Great, but bonkers price
Having said all that, I'd never buy any of it, as nice as Bordeaux is, to me it doesn't make sense from a value perspective!
On another note, when I was in San Sebastian recently a chap in a Pintxos bar was telling me he was at Arzak and a couple turned up and ordered a bottle of Chateau Petrus (not sure of the vintage). They sat down, only had 2-3 dishes, and after the bottle was decanted had half a glass each, gave the chef a glass and left - with about 2/3 of a bottle remaining! Pretty vile really - I would have gone over and chugged it