I since 4 weeks use the track now at a metal door. The application is not a problem, the door has to be clean, the rail is cut and glued according to the door width. The track sticks very strong, so you should make the right position at the first possible sticking already. Since it worked not just in my case, I had to remove them again and re-stick, but stick after the second she sits with me bombproof.
Properly installed actually comes, despite the brush structure of the rail, no more drafts under the door. Moreover, she looks decent, it falls on the first glance at our metal door hardly noticeable that here something was subsequently attached. The problem of lateral displacement of the track, as reported here frequently, I have not yet been observed. However, it is appropriate for me on a side entrance door, which is not so frequently opened.
The rail serves its purpose, is easy to install and the processing makes a stable and durable impression, therefore from me a buy rating and 5 stars.