I bought the Obravo hamt-1 one month ago and now it has run-in for almost 500 hours. What I can say is that I am really impressed by its performance. At first the bass was disorderly, the mid-range was hollow and the treble was recessive.
But after 500 hours of burning-in, the result was pretty impressive.I just used my classic Sony D-350 discman to run it, yet the bass now has become very organised, spongy and potent; mid-range has become very natural and real when portraying vocals; and the treble has become crispy and clear when portraying muscial instruments. If I plug in the hamt-1 with my yet-to-arrive Geek Pulse I'm pretty sure that the excitement and enjoyment will reach another level.