Charlie:
I use the Z5500's and love them, I just use the keyboard thru them, (well occasionally plug the strat into the mike jack and use the keyboard onboard mixer and effects) They work great, Gary's got it right for the sound, you have to use the keyboard's E Q to get the great stereo X 2 sound. only problem I have is I have to watch for the mike feedback, ( I should get a better mike) I hear great mid range, and the whole sound sparkles, and the sub bass will not let you down, Its hot.

It produces better quality sound than my Behringer Kx1200 3 ways X 2, and my Yamaha stereo 8channel PA, which has 4 club 15's + monitors. It won't crank like these rigs, but the sound beats them hands down, and I can turn it up to where it hurts, and it dosn't break down. I would recommend this also up to about 150 people in a medium room. or 100 outside.

I see someone said they were going for about $270.00 after rebate with shipping.
I also have had excellent service from Logitech.

If you want to upgrade later to a Bose system, These puppies will make your computer sound terrific. ( the sub will loosen the walls in your house/studio)

It depends what you need these for, also It mostly is recommended by guys who have keybds with onboards, which does add to its quality and strength.

My 2 cents........Cheers........Pose