A lot of that depends on if you expect (or require) a Harman-like response. I tried a bass boost of 2.5 dB below 80hz and it absolutely gives that kind of experience. The default tonality, however, is a lot more like the Utopia, just with better extension in the sub-bass (not elevation). For upper mids, I am normally sensitive to elevations in that area and I can confidently say it's not an issue at all. In fact, the upper mids may be my favorite part of the HEDDphone. On my measurements, it actually shows that it hits the target if not ever so slightly below it - but of course 4khz is also where the coupler artifact shows up on my rig as well so it's not as accurate. Based on how I hear it though, it's right where it should be.