My only experience is that I have a bottle of Rémy Martin VSOP at home. I don't really like cognac so I don't drink it much. And hardly anything like King Louis XIII.
My personal opinion is that with some money you usually do get better drinks. I've also had Blue Label which I liked a lot. Of course I paid 200 euros for the bottle and wouldn't buy that very often. Also I do like scotch way more than cognac so that might be a reason too..
As for King Louis XIII I would also like to taste that some day. I wouldn't buy a whole bottle (as I usually don't like cognac), but perhaps there is a smaller sample bottle that I could afford. Or I could find a bar that serve it by glass (which would still be expensive, but probably cheaper than 2600 euros (which it costs here in Finland).
Also this is interesting topic as I always think that after a certain price the drinks do go any better. For instant does a 5000 euro bottle of cognac then taste even better than that? I doubt it.
But for wine I have noticed that good wines do cost over 100 euros per bottle (and that you actually get better wine with that money). A good bottle of cognac costs way more than that (I could pay perhaps 200 euros for cognac when I can afford it). And good scotch would be in the same price as well. When the price goes to hundreds of euros (or thousands even) I don't think there is much of a difference. Even when looking at the bottles it seems that part of the price is the fancy looking bottle.
(Although in wines the most expensive bottles are hardly any different looking than the others).
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