Customers most agreed on the following attributes:
As everybody knows, B+W products are very good. This one is very good, but it is too expensive for what it is.
I like german products (I used to work for Germany), they are of very high quality, but again, this one is too expensive. I also bought a standard no-name (or Adorama) adapter for 3 times less money, and they're virtually the same.
I would've expected the B+W adapter to be a little heavier, which would made me believe it's made of a better alloy. But it's not. Not to say the Adorama one, is thinner!!! :)
The ONLY really good thing about the B+W adapter is the black coating which is very-very matte and very light-absorbing. Absolutely no reflection. But still, I don't think this pays for almost 3 times the money.
Do you care if this adapter comes in a nice plastic box with a fine double layer foam inside, and all this in a shiny cardboard nicely cut and printed? If yes, buy it and make sure you'll attach the box to the adapter. Otherwise, I suggest you look at similar products before buying this one.
Update: I mounted a Hoya Pro1 UV filter on this adapter, and there it is. Forever! I guess I need either special tools or special prayers before separating them.
I followed Ken Rockwell's advice and received exactly what was promised--a metal, high-quality, step-up ring that functions flawlessly!
I did not want a weird filter size, which probably won't fit most of my lens's, this allows me to use the popular 77mm filter on my 18-200vr Nikon lens...works great
I bought this to use a standard (for other Nikon lenses) 77mm Circular Polarizer on the 72mm threads on the Nikon 18-200 VR lens. This adapter provides a solid mount to both camera and filter I don't seem to be getting any vignetting at the wide end. With a thin circ polarizer I had to use rubber bands on both the ring and filter to separate the two, but otherwise everything is great.
It met all expectations of a step-up adapter.
For Nikon 35mm owners, 77mm is the standard fliter thread size for many of their pro quality lenses. I bought this step ring to go on the Nikon 18-200 VR which is oddly a 72mm filter size. I do not want to spend the money, or carry around a full compliment of 72mm filters just for one lens. The majority of the lenes I own have 77mm filter treads and this step up ring allows me to only carry I set of 77mm filters. The step up ring is good quality, theads on easily and stay on the lens firmly. I am not getting any vignetting when the step up ring is used in conjuction with a 77mm polarizer or 77mm Cokin P holder and Singh Ray ND grads. This works perfectly. Bravo.