The sub on the Logitechs (and the entire system) have shown outstanding longevity and durability for me. I had a couple of Z2200s for maybe 8 or 10 years. Z5500 almost that long. One 2200 is in my office now and I still use it daily for computer sound and practice system. The 5500 is in the living room for surround sound.
I screwed a handle on one of the 2200 subs for easier carrying. The satellites fit on converted folding music stands. I think Gary made the connectors. Got it used from him or DNJ, used it a long time off and on for small jobs and backup. Now Dean Mathis has it for NH jobs, and it is still going strong. It all fits neatly in a small overnight back from Walmart.