My impression:
I recently got the Fulla. On my wife's 2014 MacBook Pro, it is recognized immediately, all usb ports. On our old MBP from 2006, the first duo core Intel, instantly recognized, again, all usb ports. On my 2010 MacBook Air...total crapshoot on whether it is recognized, and only on one of the two usb ports. Mostly not recognized. So I got a cable like I've shown, two usb (one for extra power) to mini, and I did have to add a usb extension cable to get to the port on the other side of the MBA, and now on MY computer, Fulla is recognized instantly. Sounds noticeably better, even just streaming Hulu or an NBA game. I can remove the connection to the extra usb port (the extra power plug) once it is recognized. Go figure.
I notice just a bit of imbalance in the analog volume control, but only at the very lowest settings, basically way too low to use. If I turn it all the way up, with no music playing, there is a bit of "ticking" noise. But I hardly every have to turn this up more than 1/4.