c-losI own the SM64 v2, and I have listened to the Shure 535 and I will say that I was content with keeping the SM64 over them. Not to say the Shure 535 do not sound nice with a smoother sound, but the SM64 are just something that kind of work with everything I have listened to, and pair fantastically with the DX90 by itself without needing a dedicated amplifier. It has very good bass response, and has nice control over speed and it's tonality make it one of the easier IEMs to listen to. The mid range on this is probably one my favorite from any IEM I have owned and or listened to.