Longevity of Harman Soundsticks III speakers?

I just bought the Airport Express and am using it with Bose Companion II speakers (also new - trying out and not crazy about them). SO, I am considering buying the Harman Soundsticks III. I hear great things about them from reviews, but I just have one question - how long do they last? How long before they develop problems like a humming noise?
The reason I ask is because, for the past few years, I used Logitech z-2300's. The sound the 2300's is great, but after about 1 year, the subwoofer developed a steady hum when plugged into the electric socket even though the speakers were turned off. It's been like this in 2 apartments so I know it's not my electric wiring in the apartment building. The 2300's are plugged directly into the electricity with nothing else connected to them as I only connect the laptop when I listen to music. It has been very annoying to have to unplug them after each use because of the humming noise.
I don't want to repeat the humming problem with new speakers, so if anyone has any information as to how long the Soundsticks III last before you start noticing problems with them - I would really appreciate it.
Message was edited by: Fitness Gal

I don't have either of the speakers that you mention, but hum can also be introduced by the RF energy generated by your wireless network or cordless phone systems. Of course, if you reside in a high density apartment complex, these RF sources may also be coming from your neighbors.
One simple solution, that is well known by HAM operaters is to employ RF chokes. These are simple devices that basically wrap around a wire to reduce the effects of RF and may be the only thing you need to solve this.
An example of one of these devices is the http://www.radioshack.com/product/index.jsp?productId=2103222

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