I used to have a set of z-560s (4.1 400watt) and I really liked them for how much I paid for them. I went through 2 sets the first set devloped a problem with the control pod inside 2 weeks. And the 2nd pair lasted over 2 years till the driver in the sub gave out so I bought a set of Klipsch 5.1s and I'm in love with the tight crisp sound from them and don't want to go back
I gave my old Logitechs to my buddy who bought a cheap 8" woofer off the net and they are still cranking.
1998 SSEi The Executive Hauler
Built Trans w/ 3.29s, P&P Jenny 5, S1X cam, Silver TOGs, Northstar TB & LQ4 MAF, FWI, Dyno tuned, #60 injectors,Oil Pressure Kit, 2.9-3.4MPS, MagnaFlow exhaust, 3" HF cat, MSD Coils & 8.5mm Super Conductors, AeroForce, only Sunoco 94, 100