These were one of my first serious pairs of headphones.  I realize they're bottom of the line for Shure but they hold their own due largely to a few key points.  First, the isolation is fantastic for a universal fit IEM.  Seriously, it's good, better than anything you'll get from active NC headphones.  I know NC is a dirty word around here but I've played with a number of NC 'phones because I fly a lot but I always come back to these little IEM's because they eliminate just as much ambient noise and do it without sacrificing any sound quality.  These 'phones can be had very reasonably now days and for those on a budget looking for an excellent value, I'd recommend the SE110's all day long.  They're balanced, have great range including a full low end and I'll say it again, fantastic isolation.