Well I just received the 555... It's from what I understand, a generic tobacco type flavor. Slightly peppery/nutty, still a bit sweet and such. I've read a lot of reviews saying that the 555 menthol is more peppermint than menthol. That being said, I haven't tried it, so I couldn't say. Just figured I'd deposit some collective knowledge, lol.
Edit: Now that I think about it... I may have to pick up a bottle. The 555 is pretty decent but I'm a big fan of both peppermint and menthol. In lieu of just buying a straight menthol juice and mixing the two, I'm probably going to have to try this stuff. Any input would be appreciated from me as well!