These are simply great earphones.  They isolate sound very well and include 3 different sizes of earbuds for the perfect fit.  (I find the default medium size fits me fine)  I use them with my Zune and music sounds much clearer than it did with my KOSS Sparkplug.  The base is just about at the level I would like it at as well.  The Creative EP-630 earphones cost about $30 off of Newegg or Amazon but you can easily find a new pair for about $10 on eBay which makes this an awesome value.  I really wish I had bought these earlier.  I really can't find any cons to mention, they even match my Zune in color, the construction is quite sturdy, and I think they feel perfectly comfortable for extended use.  The cable perhaps could be slightly longer though and I prefer a bent connector are about the only things I can say.