Let me just say that I have owned my Grado RS1i for 2 years. During this time I have paired it with the HiFiM8 dac/amp, Meridian Explorer V1 dac/amp, Schiit Asgard 2 amp+PeachTree Dac-iTx dac, Cavalli Audio Liquid Carbon amp+ALO The Key Dac, and lastly the Chord Mojo. Before the Mojo there were appreciable/notable jumps in quality of sound due to rig/source that could be made out with the RS1i. Prior to the moment I plugged my RS1i into the MoJo I could not believe that the Grado could scale any further up in sound quality or that any more layers of music could be penetrated but WOW, was I wrong!!! The RS1i turned into a musical scalpel slicing away veils that were hanging over my music previously unknown to me. This is accomplished without any unwarranted sibilance while seemingly flattening the mid-bass allowing for more sub-bass to shine through. With that being said I feel like the RS1i would be a wise purchase as I feel that it can scale well with whatever analog signal it is being fed from as you upgrade whatever part of your musical rig. Just my 0.02.