I just added the EOTech G33 magnifier to my SR556E/EOTech XPS3-0 setup. My son and I took it to the range today and we put about 250 rounds through it. Naturally, not one single feeding or firing issue. What a great rifle.
The magnifier really is nice to have with the XPS3-0. 3X more than sufficient for my 25 yard indoor range, where I do most of my shooting. For close-quarters, the magnifier easily moves to the side allowing use of the XPS3-0 alone. And since the XPS3-0 is co-witnessed with the Troy battlesites, you then have a choice of sights.
What a fun rifle!
Here is the setup: