These headphones offer excellent sound quality for both treble and base. Easily better than a similarly priced (budget) pair of Sennheisers.
My only gripe with this set of headphones is that the headphone wires are equally lengthed, not allowing for one to go round the back of the neck to your ear. I never thought this would matter, but I find myself continually (accidentally) pulling them out of my ears. Also the tagliatelle nature of the wire seems to amplify any rubbing of them directly into your ear holes - again something I find heavily annoying.
These might be the views of a rustling pedant and not realised by others, but I had to resort back to my crappy senns due to aggravation.