This was my experience, too. Underpants is soft, sexy, and vanilla-sandalwoody on me, but LP was very artificial-smelling. There were apparently batch differences, too. The stuff I initially tried on was from the batch that had more saffron in it, thus making it a wintergreeny vanilla, almost medicinal. Fortunately, the bottle I'd bought (unsniffed, at the time) had more vanilla in it, but it was still an artificial vanilla frosting smell, not a soft, creamy vanilla smell. I'm a dessert foodie, so I will definitely use it, but I have to prepare myself for the frosting smell, not the Underpants smell I was expecting.
Normally in this situation, I'd say see if you can try it out first before you buy a bottle of it, but I think enough people liked this one that you could probably sell it if you don't like it. You might love it, though!