325:+'s: more detail, more frequency extension, better bass slam, better build quality, slightly padded headband, look cooler
-'s: treble is not forgiving, increased bass/treble don't led the midrange shine through as much, physically heavier (made parts of my ears hurt after a while, even with flat pads), more expensive
225:+'s: sweeter midrange, highs more forgiving of not so-well recorded material, lighter (i.e. more comfortable), cheaper
-'s: not as detailed or extended, weaker bass slam, looks like a $40 headphone based on build quality