Had a shimano Ultegra chain rivet (the install pin) go out on my gravel bike. I installed one of these and it was easy. Needed the chain tool to get the River out. But, Did not need a tool to snap the missing link in place; my hands were enough. Saved me from replacing the whole chain. If you have shaky hands this might be hard.
Also installed an 11 speed version on my road bike and no issues so far. Hardest part of ordering is to make sure to count the speeds correctly. Have been installing with waxed chains but do not wax the link and it seems fine.
I carry extras in my saddlebag for roadside repairs.
So, if you're into hot waxing your chain now, like I am, then you're gonna need some extra links. The manufacturer does not recommend reusing links after they have been removed. I'd guess that makes pretty good sense. A broken chain under power can be a real bummer and cause a crash. I don't want that. These are pretty easy to install and I have never had one fail. I'd say they do their job well and do not cost too much.
Try to do my own maintenance, which can be a pain at times, but this thing makes it a lot easier when dealing with chains. Still need a chain breaker to get the right length, but then installingremoving is a breeze.
When I was initially building up my new bike, I mainly just transferred a lot of the components from my old frame to the new one, and was figuring I could use the KMC chain it had as well. I ended up getting some used components from my cousin - which were still an upgrade for me - including a barely-used Ultegra chain. Though I'm sure neither brand recommends it, I decided to use the Missing Link on the Ultegra chain, and it works great! Have put nearly 1,000 miles on it and no issues.
As a bonus, the openings on the MIssing Link make it a nice visual reference for lubing your chain, to know that you've hit every link!
This link is necessary for removing my chain for cleaning & lubricating. I just unhook the ling & wash my chain in the parts washer. Hanging the chain on a hook allows me to spray lube on it. Slip it back on the gears & hook the link back together.
Inexpensive and reusable, I install these on all my chains so that I can break them and reattach them for cleaning and other drive train maintenance. Years ago, I also purchased the Park tool that makes removing the link a one-second process, although you could also make a small needle nose plier work as a removal tool. No tools needed to reattach. Simple and practical, these make removing and re-installation of drive chains an easy-peasy process. If you care about having a ridiculously clean drivetrain, you need these on all your chains.
A broken chain link on the trail is rare, but it happens from time to time. One of these in your kit is a perfect companion to your multi-tool - - you can fix your chain without having to compromise its length. And it's a LOT easier than trying to drive a rivet back into a link!