Summary: One of two speakers bad out of the box. A different set we ordered had the volume cut out intermittently. Seemed to be related to the volume control. If it worked, it would have been nice. I liked the size and the audio quality when working. Would not recommend this due to the poor quality.
Summary: They work good as long as there is sound playing out a loud enough volume. At low volumes, or if there is no sound to be played, there is a constant (but quiet) buzz sound coming from them. Also, there is a loud (almost full volume) static noise/pop when shutting the system down. I had to use a seperate device to be able to toggle between headphones and speakers to prevent this pop. My guess is that they are not grounded very well internally.
Summary: These are great little speakers that are convenient due to the fact that 1. they're small and 2. they're powered by USB. You're not going to get amazing sound out of these, but they're loud and clear enough where it justifies the purchase. I like how you can roll the extra cord in the back of the speaker so you don't have cables lying around your desk. I do wish they came with a volume knob, but it's not a deal breaker.