I received my Vapor Extreme Metals Ni case about a week ago after being on the waiting list for a month. It arrived within 5 days of my order once I got their invite and code to order it.
I love the look, the Nickel finish is flawless and is looking even better every day as it acquires a patina from hand contact. I like the discoloration, it gives it a neat worn look.
My big complaint is that I lose at least one WiFi bar at any hotspot unless I am in the same room as the access point. Likewise, my tower signal strength is visibly lower by at least 1 bar. Both of these issues are deal-breakers for me since I work and live mostly in rural fringe areas. Prior to using this case I had an Apple bumper and I had adequate signal strength in almost all of my traveled areas. Now I lose signal and drop calls a significant percentage of the time. I can't use this case any longer.
Bottom line is, if you are in an area with blanketed coverage as your primary use are, you'll probably be fine, but do expect issues if you travel to less well-covered areas.