Summary: Seems to work fine, paired with the Audioengine 5+. Not sure if its worth the extra $$ to go with this but I did and I'm fine with it. Be aware my first D1 did not work properly, thought it was defective. Crutchfield was awesome (as usual!) with the return, then the 2nd unit behaved the same. I plugged a 2.0 USB splitter into my 3.0 port (basically downrated my computer's USB port) and it worked fine.
Pros: It works, makes using the Audioengine 5+ speakers a little more flexible. Purchased from Crutchfield so the problems I had were handled awesomely.
Cons: Is it worth the additional cost? Had to return 1st D1 due to incompatibility with 3.0 USB port, downrating the port solved problem.