I have never experienced "M", but Pheromone for Men was my signature scent for a few years. It was, in fact, the only cologne that I bought more than a few times (next to Monsieur Musk.) I even wore it to bed! I have two 1.7 oz bottles plus the shaving balm and a black faux leather case it came in.
I still love Pheromone, but I don't wear it much anymore. Perhaps I got burned out on it. I did find out that it had a tendency to turn very acrid, dry...even slightly ammonia-like in hot humid weather. I've gotten lots of compliments on it. The last person that comented on it, accused me of wearing perfume.
I must admit that it is somewhat perfume-y and it is very close to the original women's version, which is VERY green and "dusty". Both versions remind me of Windsong perfume.....somewhat.
It's nice, powdery, green, very dry and dusty, with lots of labdanum.
Basenotes states it came out in 1999. WRONG! It debuted in 1980: two years after the original.
And I don't believe a single word about the Egyptian basis of it's formula, nor the claim that it has pheromones in it.
It's a marketing gimmick that ranks right up there with late 19th and early 20th century "cure-all"/"miracle elixir" sales pitches. I can just hear it now...."Step right up, folks! What I have here is an ancient Egyptian formula for attracting the love of your dreams! A magical formula decoded from ancient Egyptian hieroglyphs!!!"
WOW!!! I gotta wear Pheromone tomorrow!