I purchased the E855's a few weeks ago, and I am powering them with a tube amp, which outputs 30W in triode, and 65W in pentode mode.
I love these speakers, they sound fantastic. What a value for the money. I do not think that these speakers are a joke at all. Anyone who get a chance to listen to Jamo, you should, and decide for yourself.
Even with a tube amp connected people think that I have a sub somewhere in the room, that is how good the base response is, and no it is not that boomy horrible sounding bass, but clean, and tight base.
Acoustic, and vocals sound amazing, and they will play Hip Hop or any other type of music well. This is just my evaluation with an ipod as a source. I can't wait to connect a good quality CD player.