I’ve read some people reuse them and some as the instructions recommend don’t . I recently put a new 11 speed groupset on my bike replacing a 17 years old ultegra 9 speed group. With the Sram 9 speed chain I reused the quick link 5 or more times with no problems. I’ve reused the quick link on my 11 speed a few times now with no problems but I’m wondering what will happen if it does have a problem. I do have an extra Shimano quick I carry with me and can put it on if everyone thinks it’s necessary. My next chain will be a Shram.