Any multi-USB adapters out there work with the new MacBook??

Are there any adapters that will power more than one USB device and charge the new Macbook at the same time through the USB-C connector other than the poorly designed, poorly reviewed USB-C Digital AV Multipart Adapter from Apple? I don't need an AV out; I do need one that will charge the MacBook and power at least two USB devices at the same time: an USB-connected HP printer and a Seagate HD backup HD. All I see is the Apple device for $79, and, according to reviews, it's a dog.