I have the Mojo for 2 weeks now and during that span I tried 4 cans, (HD800, T1, T51p, SR-507/SRM-323S). Of course each can has their unique Sonic Qualities/signature but one thing I notice so far that is true for all the cans is that the Mojo brings out the best qualities of each cans forward and flaws in each seemed diminished if not rendered unnoticeable.
Tonight, I gave the RS2e a run with my Mojo. Which I have not been using for quite a while due to it being generally bright and harsh and thin sounding overall. However, when paired with Mojo, the overall sound seems to have gained a bigger body, harshness is noticeably reduced which allows me to discren micro details much more clearly. The bass which is used to be on the boomy, slow and bloated side now sound leaner, faster and hit harder. I think this is the first time I listen to my RS2e for 2 hours straight and still not feeling any fatigue.
The mojo did not turn the RS2e to a darker can. Far from it. It still has that strong energy on the treble and unique Grado sound is still very much recognizable. Just without the harshness or the extra energy the makes fatigue settle quickly.