What kind of stuff are you gonna use them for? Pop, rock, drum n bass, dance, techno, anything modern infact will sound great (not accurate great, it will sound quite different to how it really should, but pleasant).
The mid i'm sure you know is the bit between the bass and the treble (well duh, that's aimed at me not you, I can't stop writing shit today), scooping it out makes it much easier to make speakers sound 'good'.
These speakers will be a big step up from any other computer entertainment speakers, I guarentee you'll like them.
BUT, I own what is effectively the late 1980's version of these
http://images.google.com/imgres?imgu...3Doff%26sa%3DN
They sound so natural in comparison, even hooked up to some cheap £30 amp off ebay. You can pick these speakers up occasionally from ebay for £80, or $160, and they're actually really really nice. If you just want good sound get them or something similar, if you want the hassel free 5.1 thing with the big sub then z5500's are great.
I don't quite understand your question about the software; these speakers come with no software. Perhaps it's a program that comes with the sound card? I can use my soundcard software to drag a dot around a virtual room on the screen and the speakers reflect it if thats what you mean.