Hello,
I've had my brushed metal Blackbird rep for over two years. As said above, it's very much like the Gen except the caseback. I don't know about which version I have, but it's certainly a great watch. I went for the more pricey version so the the cronos were correct with a good movement.
When you plan to buy, try to buy from someone who will check the position of the lume at the 12 o'clock position. Mine is just a small fraction off centre but not very noticeable. I don't know how off-centre they can get, but I'm happy with mine.
Unfortunalby, two screws fell out before I had a chance to use locktite on it. I don't know where to get replacement screws, or even if it's possible to get hold of some.
Good luck with your search.