There is something to the "grass is always greener" theory, it's happened here on this forum as we have lost members to other manufacturers.
I imagine a few 350Z & RX-8 owners have had second thoughts also and wish they had bought a Crossfire, probably a few have.
As for me, I do my research, know myself and my likes and dislikes and my motivation. I am 100% happy with my Crossfire and intend a long term relationship.