Our band uses this for our keyboards, either one in stereo or two in in mono. We got this because so many places don't have enough or any di boxes at all to provide during a show, so we must bring our own. In the interest of having as few di boxes on the ground we chose this dual unit.
So far zero issues, hum was destroyed and the signals were balanced.
Build quality feels really good. Unless you really abuse these, I doubt you'll have any break on you.
It's not super compact, and I don't personally much care for the look of the thing. So my only desired changes would be visual.
I will definitely continue to buy ART products as they seem to be pretty solid.