I've been able to check out a load of Beats by Dre headphones when me and my friends had some fun in a local electronica store just checking out the big 3D TVs and such. They had a headphone section with a surprisingly half-decent selection of headphones.
But to my surprise, I don't know what it was but they somehow managed to make every single pair of headphones there sound rubbish. And I took a quick sneakpeak about the place and found that they had like batches of 6 powered by the same amp (It was a tiny metal box with 6 3.5mm outs labelled "headphone amp"). So I really couldn't tell how good anything was. Even the HD700 didn't sound great in that place.
I can tell you the solos feel incredibly cheaply built.