I used to wear a lot of Fierce so can only really comment on that but I found it to be a really nice frag, quite a young persons scent which is why I don't wear it nowadays, longevity wise it stayed with me for a good 8 hours with good projection. It was a massive compliment getter, second only to Escentric 01.
I have had a couple of Mont Blancs though not specifically Legend and Fierce would be my preference over them (Exceptionale and Starwalker) as I found both of them faded very quickly.
I don't know how old you are but anything between early 20's and mid 30's and you're in prime Fierce zone so prepare for a bag load of compliments!