Once you strap the PAM317 on your wrist, if it makes you giggle like a little child, then you know you made the right choice. If you have even the slightest dubious thought when you 1st strap on the watch, then you know you probably will eventually trade it or sell it. That's just my personal opinon from past experience.
If you're buying the PAM317 without having seen one in person, this is one of the few models that will probably definitely impress you and hopefully you'll fall in the former, rather than the later as mentioned above.
Cheers,
Anthony