I nearly bought Intensa, without trying it when I luckily stumbled upon a cheap decant of Intensa. I have both Colonia & Colonia Assoluta and I can tell you that I don't think Intensa is anywhere in the league of its older siblings. It has a woody, spicy opening and quickly settles down to a musky accord. The musk is too overbearing for me and it really ruins this fragrance for me.
As for longevity, I get maximum longevity from Assoluta. Both Colonia & Intensa have average longevity and below average sillage on me.
I don't think Intensa can be called a 'lemon' fragrance at all. The citrus in this is muted and is clearly overshadowed by a lot of woods. If it is 'lemon' that you seek, you'd have to stick to the original Colonia if you want one from this house.
Ofcourse you have several other choices from various houses if you are looking for a lemon scent.