Here are a few thoughts:
The MP3 frill has virtually no appeal to many (like me) in contrast to the vastly more important and driving reasons I want a PV in the first place. --
As others have mentioned, superior function, durability, simplicity/user-friendliness, reliability etc. will override the purchasing choice for a considerable chunk of the customer market. - Some will find these frills attractive of course, but I would predict you'll succeed in only effecting an unnecessary and narrower delineation of anticipated market-slice.
There's ample historical evidence, from the standpoint of product commercialization, that the "combination-devices" or "multi-function" products.... although perceived as sexy from a designer's-eye standpoint... quite often fall flat or miss their mark. For example, the combination TV-VCR, the Multifunction-Printer/fax/copier, the combo Rifle-Shotgun (by Savage & others), the Ford Ranchero or Chevy El Camino, etc. etc. (you get the idea).
Now that's NOT to say there wouldn't be a market by any means. It's just that more-often-than-not many such 'combination' products, by virtue of the necessity of engineering economics and other inescapable compromises.... wind up being necessarily inferior in the expression of each of their component-functions.
Take the example of the idea of a combined Car+Truck like the El Camino or Ranchero as mentioned; I owned one before, and like most everyone else I knew... we found it's actual utility & capacity very weak in either (both) of it's functions. - In addition, like the TV-VCR combo or the MFC... quite often the malfunction of just one of the component-elements can render the other functional elements useless as well. -- [**Be especially sure to have your engineers carefully segregate these aspects so as to avoid jeopardizing the ability to continue using the PV despite the potential malfunction of the MP3 electronics etc.]
But that's just my two-cents worth.
Just as an aside... I've got 2 of the 510 kits (4 e-cigs) from cignot on their way, and I'm hoping I'll see them arrive today. The 510's are intended primarily for introducing Vaping to friends and family members. I rather anticipate having to order more before the end of the week.
BUT what I'm really excited about are the
2 JANTY-Stick kits on their way as well. I'm hoping they'll get here tomorrow!!

Those are ALL MINE!!
cheers,
fisch
