Any users considered this case/extended battery for their Note 3?

Was looking for accessories, stumbled across Mobilefun.com and saw they are taking pre-orders (ships in a week) for a case that includes a 3800mAh battery that can charge your phone. Called the Power Jacket. I've seen iPhones that have a similar case/battery. Any thought on this?

Power Jacket Case 3800 mAh for Samsung Galaxy Note 3 - Black :: MobileFun.com

Honestly I am a heavy user and get about 35 hours with 6 hour ish of screen on time from my Note 2, and the note 3 power management is much better and the battery is bigger. So if your good making it easily through a day i see no need for it; not to mention the note 3 is sexy not in a case lol
 
Fair enough :), I quit using cases myself on all my Droids. My Razr Maxx HD doesn't even have a screen saver. I'd really like a folio case for business use, but even that seems to be more than I want.