I've just taken delivery of some DT 1770's. It's early days but I have to say I'm extremely impressed. I've been away from the head-fi scene for a few years and I was after a new pair of closed cans. I auditioned the PM-3 and really liked it but I thought the bass was lacking a little bit in definition, also vocals were really nicely presented but felt really close in a strange way. After doing a bit of research and seeing a reasonably priced second hand pair I bought DT-1770s on impulse.
Loving them so far. I think they're really well balanced. The most impressive thing for me is the texture and definition of the bass. Really outstanding. I sold off most of my headphones a few years ago and my favorite setup was probably my HD-600's connected to a Woo Audio 3. I have to say I think the DT-1770 edge them out in most areas for me but probably not soundstage. These have a nice sense of space between instruments but its not quite so easy to position them in your mind. I am aware that your are going to get a bit of a compromise on soundstage with closed cans.
I'll do a better review of them in the coming days.
Oh and I'm powering them with a Fiio Q1
( might have to do something about that.. but it still sounds great!)