From a BMX standpoint, this is a much better solution, because almost all internal-gear rear hubs greatly weaken the rear axle. You don't want to do huge drops on a IGH.
By moving the IGH mechanism to the middle of the bike, you allow your axles to be as strong as they need to be.
Info about the Hammerschmidt itself:   
The Hammerschmidt is part of SRAM's business, so it's a reliable brand.