Good question. I am no expert at all (and have not even been to the Superfeet site to read up), but my understanding was that Superfeet were more geared for athletics -- correcting "issues" with footstrike as well as taking up space in shoes for people like me with low-volume feet, and supporting our feet in the proper position. If your Danskos are already comfy and fit well, I don't know that inserts would be necessary, and might throw off the fit. I don't use Superfeet in my "street" shoes.
For lots of standing on the job, you might want to consider the Spenco gel inserts instead. I use those in my hiking boots to combat foot fatigue on long hikes, and they are (for me), da bomb! They provide cushioning, though, not "support" per se.
I am sure Knotted will correct me if I have told you wrong. I'm speaking purely from personal experience/opinion and not from any professional knowledge.
Emily

