I demoed the SE210 and thought it was too bassy with not enough instrument separation, ie "muddy". Does the SE310 sound better? How much better? I would go for the Ultimate Ears Super.Fi 5 but I want to like the Shures because of the fit. I own: Grado SR-60 & SR-325i, Sony v6, Ultimate Ears Super.Fi 3, and AKG K271 headphones...so if you could compare the sounds to what I own I'll be your best friend forever.