I also have a Motion Sound KP-100, which fits neatly between the back seats of my van. It's for backup purposes only, and the only time I would use the Motion Sound is when everything else fails. I found the KP-100 provided less than stellar sound quality, even under the best of circumstances. Additionally, having taken mine apart to tighten the main board, I quickly discovered this is the most overpriced, overrated amp I come across in decades of working with sound systems. The combined amp components, including the speakers, could not have cost more than $100.
Back to the Logitechs, which was the main thrust of this post. Of the hundreds of Synthzone, PSR-Tutorial and SVPWorld members that have purchased the Z-2200, Z-5500, Z-5300 and Z-2300 systems, I only know of three individuals that said they did not like what they heard. If Logitech ever finds out what we are using these inexpensive systems for they will likely jack up the price by a couple hundred percent.
As I said earlier, but the system from a reputable retailer that has a liberal return policy, then let your ears be the judge.
Good Luck,
Gary
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Travlin' Easy