From the designer:

Yes there are lots of other battery holders including my own, BUT this one is king of aesthetics with its color and design looking to pair with the DeWalt family of tools. Mounts solid to the wall and holds up to 4 of even the big flex volt batteries. Hollowed out to not use so much plastic and strong enough to keep them locked in. Lets face it we all buy the most expensive tools because A- They work great and B- They look good so the accessories have to match.