i am currently using it as my keyring, and also am interested to see how long it lasts. a ring's plating will last 6-12 months depending on wear, you can tell very easily on an engagement ring when it is worn down because the bottom of the ring takes the most abuse so you can see the colour difference, a plain wedder (or keyring) takes general abuse everywhere so it blends in and is difficult to notice.
So far i have been supprised at how strong this metal is and how well the plating is lasting. but its only been 3 or 4 days now so time will tell.
I will be crystal clear on my findings so that you can make a choice that suits you