Re: 10 hours battery
To be fair, if you're going to be using it constantly, you're likely going to be static, and that means you'll likely be near a mains point.
I'm looking at one for someone who needs a portable wireless-nas-in-a-portable-chassis for sharing data acquisitions from hardware on multiple sites; turn up, fire up Seagate Wireless thingy, half a dozen engineers connect to it, map as drive, one engineer grabs data from equipment, save to mapped drive, and the half-dozen other engineers there immediately have access to it without having to dick about with USB drives, versioning issues, etc. No internet access required for this either.
OK, niche usage case, but fits that niche nicely, it seems - certainly better than carrying a one-bay NAS and router around - or trying to share his laptop out as a file share, permissions issues, etc.