Those are nice.
I used to make my own sets that I sold to the Valkyrie crowd, just remember that whatever they state for wattage is BS, the size of the amp and the internals is good for roughly 38W RMS per channel, after that you would need a much larger amp with inverters build in to get above that.
I have seen those in person and they do sound good. If you have a decent mp3 player set the EQ to vocals to get better highs and mid range out of them since bass gets droned out by road noise.