This was an easy and cheap replacement on a Michelin tube. I must have bent the end of the old core with the pump (would still hold air but made pump attachment difficult). The old one was easy to remove by hand and this was easy to install by hand. Functions as good as the old core.
I have broken off a few valves over the years and it works well just to replace the valve stem rather than the entire tube. I also have started to use tubeless tires on my gravel bike and these work well to replace the old valve stems.
It's worth it to pay a little more for Stan's Replacement Presta Valve Core. They are made much better (stronger, better materials) than other brands.
When you run tubeless with sealant you're eventually gonna get some gunky buildup and small leaks from the valve core. Always good to have an extra laying around when you need it.