Those things are just great.
The only thing that disturbs something that is extremely glaring blue light diode, indicating that the things are turned on.
And when you turn on / off, it cracks before.
But apart from that you can not find anything better for the price certainly.
I had several other, more expensive, "hipper" boxes, all of which were nothing compared to the Genius SP-HF500A.
Addendum: I just hear Pink Floyd's "Sorrow" (YT watch v = AdKNlGfkyhc) what the reason is for this addendum, because in the beginning so from 1:30 there are low-end power, the benefits of these little things. Madness!