I went ahead and purchased these along with a pair of SoundSport wireless earbuds. The combined price ($200) put them on par with what I would pay for a pair of Jaybird Freedom earbuds or Powerbeats 2 when they aren't on sale.
The case isn't necessary but it is nice. The case is compact, securely stores the earbuds, and has plenty of space for a USB in the case's internal pocket. I usually rely on the case for charging my earbuds after they ran out of juice. It's really convenient as I will plug my earbuds into the case, zip them up, and leave them in my car overnight to charge (though it only takes about an hour). I'll do this about 3 times before the case needs to be recharged and I will do that either with a USB charger in my car or one in my office.
The case is a convenient way to charge your earbuds wherever and whenever you want. It has a multi-colored LED light that will let you know just what the case is doing whether it's charging its internal battery, charging the earbuds, or if you are just checking to see how much juice is left in the case's battery.
The case seems well-built though the outside soft rubber of mine is already showing signs of wear after putting the case in my pocket a total of three times (there's a scratch across the Bose logo). But they still work fine. I recommend these to anyone who wants a convenient, albeit completely unnecessary, way to charge their earbuds while protecting them.