Brad:
I've got these (well the 5 speaker version) and they are nothing special. The system I bought from asda for £25 is loads better and sounds better too. There is nothing really worng with them but from logitech I would expect better.
They are only really any use with a PC as they are not that powerful, there is no remote (the ASDA ones you can change source, adjust the outputs from each speaker , a master volune) Finally, the logitech only accepts one source so a pain if you use them for your TV and wanted to change from SKY to DVD etc.
To be fair, I think the primary purpose of these is intended to be with a pc.
For a home cinema i think you might want something a bit more powerful