I have an Atlas on my SCAR 20, and have also run a Harris on all of my SCARs at some time or another. I don’t own a Magpul bipod, but I recently shot someone’s suppressed 6.5CM Bergara off one and it was great. I don’t see anything wrong with it.
For what I do, Harris is my first choice for ease of deployment and the ability to easily cant (BRM-S, or S-BRM). The Magpul is also as capable and about the same price. The Atlas is very well built, but it annoys me in that you have to individually deploy each leg and put it in the notch you want. For me, being able to quickly deploy both legs of the Harris with gross motor skills works better, and I just manipulate the length of the legs and the rifle itself to get on target from there. I will probably buy a Magpul for my next bipod.