Pineau de Charentes is not a common drink in the US. It is a French fortified wine made from blending brandy (usually unaged) and fermented grape must, which is juice made from the the seeds, skins and stems of the grape.
Paul-Marie Fils Pineau de Charentes is unusual in that instead of being made with unaged eau de vie, it is made with Cognac and then further aged. According to David Driscoll's excellent K&L spirits blog, "It was made from Cognac distilled in 1984 and then white wine from 1985 and put into a barrel for 25 years!" A twenty-five year old dessert wine is unusual indeed.
Paul-Marie Fils 25 Year Pineau de Charentes, 17.5% abv, ($80 at K&L).
This stuff has a very nice aroma. The first thing I get on the nose is Cognac, a sweet one with raisins and other dried fruit, then behind it some of the dessert wine notes that give it a fresh and sweet scent. The flavor opens very sweet, but it's much more complex than most fortified wines I've had, with some of that aged Coganc flavor integrated into the sweet wine. I taste plums and other stone fruit along with the sweet wine flavors and some nice Christmas-type spice. The late palate to finish is very port-like.
This is much sweeter than what I usually drink, but it's quite a pleasant dessert wine with some real depth. I tried it both neat and chilled, but much preferred it chilled, which muted a bit of the sweetness.
If you are a dessert or fortified wine fan, you should definitely check this stuff out.