I hate to muddy things but have a Zenith MKII by Innuos and am very pleased by the sound, and I haven't had any issues with using it. In fact, the one or two questions I have had along the way were answered very promptly by Innuos. To my ears, the Aurender seems to do a great job with the upper half of the register and the Innuos seems to be bottom-up, so maybe that info is of help to you.
I suspect either will be a great choice, but wanted to share my two cents!
I suspect either will be a great choice, but wanted to share my two cents!