i have two sets one for a airport express in a lounge room and one pair that replaced the z5500s i had.
They reproduce audio recordings pretty damn accurately for their price.
Id say more so better than the z5500s as well the sub and bass mudded out the true audio of music.
i listen to anything from hard rock, heavy rock, new wave, alternative, drum and bass. (ex. new order, joy division, depeche mode, siouxsie and the banshees, slayer, kmfdm, misfits, Pendulum, Dom & Roland (DnB), Nine Inch Nails, bat for lashes, etc)
The audio sounds clear accurate and reproduces the variety of styles really well. If you want to adjust the output just either use itunes EQ settings or an external EQ device. BUt overall as is theyre pretty solid.
For hiphop or rap, mainly theyre recorded with the low end boosted way up or end users boost the low end way up and ruin their speakers with unnecessary boosting.
So overall I'm quite satisfied with them and dont regret buying them yet and replacing my z5500s.
hope that helps. you can find them at best buy or guitar center for about $149 + taxes and amazon.com for about $164 new.