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I was bought these speakers when I bought my iPod 4th Generation about 4 years ago. This set of speakers is still in my room and I still occasionally use them. Despite having them for a fairly long period of time and considering that speakers notoriously break or degrade in sound quality over year, I am very impressed with how the sound is as good as the day I got the speakers.
I do use other speakers now and admittedly the quality from these newer ones is slightly better than the Altec Lansing ones, but with 4 years worth of technology advances, I would expect them to be.
The build quality of the speakers is pretty good. it is solid enough fro me to take pretty much anywhere without fear of them breaking, however it does feel a little plasticy and cheap tot he touch. In my opinion the placticy feel is irrelevant as I only really care about the sound - they are speakers after all!
The bottom of the speakers is slightly rubberised to prevent slipping - I say slightly as it is not rubber, it isn't quite that good, but it does have some sort of material what does enhance the coefficient of friction between surfaces. It has prevented me smashing it to pieces on numerous occasions.
The main advantage of these speakers is the portability, the speakers, for their sound quality, are surprisingly small compact. This means that you can take it with you on long trips without it being hassle to pack into your bags. I used to frequently take it with me on trips to Wales (I live in England).
I received these speakers as a Christmas gift to use with my first iPod in 2004 - and am using them with my third iPod today. Furthermore, the sound quality is just as good as it was when I first plugged them in. I sought these speakers specifically as they were portable; I have been living between the States and the UK for the past five years, and the speakers are light enough to pack up and bring back and forth with me. The small size in no way sacrifices volume, however; I often turn the volume up loud enough to hear it in the shower, and suffer from no distortions to the sound quality. I think the most impressive thing about these speakers, however, is their longevity - I'm so used to having to replace my tech items every two years or so (like I said, I've gone through multiple iPods since initially getting these!), so it's been nice to have been able to get my money's worth and more out of these very reliable, good quality speakers.