Few questions for cognac lovers

1 Is Courvoisier Napoleon a quality product, with pleasing aroma/taste?

2. Is Hennessy XO for cognacs, like Zacappa 23 for rums? (an overpriced sugarbomb inside a fancy bottle?)

3. Is Martell Cordon Bleu as good as they say? Am i correct to think of starting my expansion "upwards" from here?

4. Which XO most people believe is tastier, from the big 4 houses (courvoisier, martell, remy martin, hennessy) and which one out of them all is less sweet than the others?

5. In case i decide to grab Martell Cohiba, would i enjoy it neat, without a cigar to pair?

6. What are some great, easily accessible, widely distributed, non-special edition, cognac-cask finished rums? I wanted to start at Rhum J.M. but it is extinct, already...