I ordered these for our local Bike Kitchen, (all volunteers). We re-hab bikes for underprivileged kids. The non-professional mechanics there go thru a lot of these. If you're careful and make sure the pin is lined up correctly on the chain they will last pretty-much forever. Try to use it off-center and it will bend.
...because I broke the one in the Park tool. Must have been pushing the pin off-center, and it broke. Great that these are available!
Replacement Park chain tool pin that comes as a 2 pack
What can you say about the pins they just work.