I use pheromones on a regular basis, so I'll give you my take on this. Essence of a Woman (which is apparently in the female phero blend) has NEVER failed me. I don't know the dosage... err, how much is in the perfume... but with just a couple of drops, my boyfriend usually jumps me within the hour. Which is to say, you want to use this with as much caution as you would Love Potion Red... though you already seem to be familiar with the amorous reactions
People who know you personally know your pheromone signature, and when you wear a different pheromone you're kind of... forcibly changing it. The people you're close with may react in different ways - they may be a little iffy around you, or they might not even notice the difference at all. With strangers, it reads more strongly, which is why the Androtics (people who supplied the alpha nol, etc) customers tend to test out new products in public places, where strangers can re
act to the pheromones as opposed to family or friends either being a little freak
ed out, a teeny bit affected, or showing no reaction whatsoever.
As for pheromones becoming part of your signature as time goes on, I can't answer directly, because I never wear any one mix for an extended period of time. It is discussed somewhere on the pherotalk forums if you feel like digging around there, though.
As for how they're percieved, it's purely subconscious... I mean, I could be standing a few feet away from you, and you certainly wouldn't think "Man, those are some amazing pheromones she's wearing!" None of the people I come into contact with wear them, so I can't say if I would notice them on someone else. But unless you're around them all the time (and even then) I think it's just a very subtle suggestion to your brain. Or something like that. xD