I have together and working pretty good. I didn't bother to paint them. I really wanted to hear what they would sound like. I recycled the old grills for now and just used hot glue to hold the wires. Hope they don't get confused for Grados. They are solid and it really shows in the bass department. The best way I can think of describing it is if a bass head headphone is like hitting with a rubber sledge hammer these ones are hitting like an iron hammer. The notes that should be finished are finished nothing fuzzy. Anything with strings or brass just sounds great but that seems pretty standard with the 407's. I think the treble is a bit hot though. They are loosening up the dustcovers are not as tight as they were when I got them. I will have a pair of O2 Mk1 soon and should be able to figure out more.