I haven't tried nearly the whole line, but in the ones I have, there isn't an underlying theme connecting them. Perhaps someone that has tried most or all, sees a connection they could share. I was very close quite a while ago, to pulling the trigger on Straight to Heaven, but chose against it eventually. I think it's a fantastic scent, but US225 ( this was before the travel set came out) is a little above my pain threshold. I think they are clearly quality scents, and all deserve to be tried. Whether or not they're worth it is completely subjective and up to the wearer.