I received these speakers from Logitech as a replacement for the z3. My first initial reaction was oh no....they are white. I was ready to ship them back, I have an odd matching problem....black computer and white speakers. I went ahead and plugged them in, they looked cool (other than being white) and I had to hear them. One word. AMAZING. No matter what music I pump through them from country, classical, children's or hardcore rap they hold up and they sound beautiful. I cranked up the bass and the volume as high as it would go to see just how wonderful they were, and again, amazing.
Hooking them up to my computer was seamless. Easy directions to follow so even your less than average user will be able to manage hooking them up. They have a cool blue light to indicate they are turned on and ports up front on the control to hook up headphones or mp3 player.
I very well would have missed out on these wonderful speakers had I gone on looks alone. Hearing them changed my mind instantly. You can't go wrong with Logitech's Z4-I speakers!