The first thing most listeners will notice with the 535's is their phenomenal mid-range response, which is largely out of style in most of today's popular (read: crap) audio products. The tight, clean bass is delightfully present in the mix without clouding over other ranges. The treble is bright and organic, not harsh and overpowering. The improved bass response, build design, and crossover sets these apart from earlier and lower models (I actually did an A/B test with the 425s vs 535s since I own both - the 535s won by a huge margin). I love cranking these puppies up...it feels like the music is emanating FROM MY BRAIN. Make sure you get a good seal on the 535's and they will change your life. Boom.
I have been very loyal to Shure for the past 5 years or so for their honest sound, quality builds, and great customer service. I had the E4G's and SE425s for several years, and when the cord broke on the former pair, they shipped me a brand new pair without question.
Bottom line: these aren't for "pop" audio listeners looking for destructively rumbling bass and over-cranked, shimmery highs. Try Bose, you will be more happy with the inaccurate replication of the music. For those seeking full, powerful, honest sound with a great build and innovative features, buy these and don't look back.