There's nothing "wrong" with them, they just are not what I would consider a "decent" sound system. Neither are the Z-5500 or Klipsch Ultra 5.1. In fact, no computer speakers are what I would consider "decent". I used to have the Ultra-5.1s, and they are right now dis connected and sitting in a corner gathering dust. I am going to sell them as soon as I get a big enough box. Compared to my headphones and amp (Audio-Technica ATH-A900LTD & PA2V2), they have horribly recessed midrange sounds, and muffled highs. Their only decent point was the bass, but even that was not GREAT. "decent" speakers are very expensive ($1-3k, or much much higher depending on how high end you are getting), and the only way to get "decent" sound for under $1k is headphones and an amp, with a good sound card that supports ASIO. When I need surround sound (like in games and movies), I just enable CMSS3D, which IMO when paired with a nice set of headphones that already have a huge soundstage to begin with, it is even better than my ultra 5.1s were. Plus, it's positional audio is not limited to how many speakers you are using.
so, umm, err yeah