Tons of life left. Only used for one track day before I sold the car. Loads of stopping power, hard bite, little pad wear, and no fade, as compared to the pitiful stock pads. If you're taking you're 550i to the track, these are the pads to get!

https://i.imgur.com/H5lKpFd.jpg
https://i.imgur.com/DDSWeAn.jpg
https://i.imgur.com/HUmxVj1.jpg
https://i.imgur.com/xfeOZYo.jpg

Make an offer. I'm sure they fit other model BMWs, but I don't know which ones.
PM me, but if it doesn't work, email me at 5series@jonsimon.com.
-Jon