I just got some of these and other than one of the split rings being a bit small for what I had to mount it to I like them. They survived one trip without a mark on them, something I've never seen happen with other tags. The only rigid parts of them are fairly tough metal and right next to the suitcase, I think they'll hold up much better than the usual plastic backing with a plastic tether.

Also, from the outside they just look like a name tag. There are two pockets inside the tag that hold pieces of paper the size of a standard address label. (Note: If you print address labels and stick them to something align them carefully, you've got to be almost perfect or they won't fit.)

I've got papers in there with addresses at both end minus the street address--but if you pull the paper out there's another copy of the address with a street address. No bad guy checking tags in the airport is going to find that copy.