So well, i was listening to them in one shop who is official dealer.
Good sound, but not perfect. Seal is not the best. Built quality is normal.
I was listening to the new ones and used ones from one seller who give me his phones to feel difference.
I like their sound, but they don't need my HFM601LE, from iPod you can get a good sound. Rock music sounds very interesting, i like it.
But then i decided to listen to Sennheiser CX175, which are twice cheaper (90$ vs 45$ in my city), and i was really surprised with them. Aaaaand, i've bought them. They don't have a beautiful Nergy treble, but their soundstage is wider and deeper, much better bass, good mids (different characters with Monsters, but both good) and not so good treble. Sennheisers are better for not hard music, Monsters are better for harder genres.
Built quality and seal are perfect. Simply super.
Also they are sounding good from all sources.