X-540 a great choice

I bought these shortly after buying my new Dell Inspiron laptop, as the laptop speakers just didn't cut it.
I am very happy with my decision.  The sound quality is great and is sufficiently loud for my uses, which include gaming and music.  I'm a bit limited on speaker placement though, especially the rear speakers, since the wires for the speakers are just a tad short for my liking.  Subwoofer is smaller than others, but it hits hard.  Headphone pass-through is a convenient feature, but be sure to turn the system off before plugging or unplugging headphones.  Matrix mode works well too.
There's also a splitter included to easily connect red/white RCA "phono" audio cables from TV's, stereos, and what not.  The subwoofer seems like it's not quite as loud as it was when I bought the system eight months ago, but I may have just grown used to it, or it may be just something to be expected of such a system.