Fortunately, I've only had to use one plug (pointed). Received a 4mm cut 1/3 distance between center tread and rim on a Schwalbe Pro One 700x25 mounted on a Dura Ace rim. Sealant wouldn't hold over 2.5 bars. Installed plug and it sealed instantly. Didn't have a blade to trim excess fibers so I just left them. Completed 60 mile ride without any loss of air. Trimmed fibers that evening. Plug lasted another 1000+ miles before it just stopped sealing, even with Stan's Race Sealant. Bought a refill pack of pointed plugs to make sure I wouldn't run short.
In my tubeless life I've had one flat that required a call-of-shame to my wife to pick me up. After that I started carrying a spare tube, which I have not needed and never looked forward to using because of sealant mess.
My friend sold his bike and gave me his Dynaplug repair kit with only one plug left. I ordered these repair plugs just to be ready for a puncture that is too big for the sealant and not big enough to require the tube (or the call to the wife).
Thankfully I have not needed them but it is good to know they are there.
My friend had success when he used the original plugs that came with the repair kit so I assume these will also work fine, And to clarify the headline, I DO know how they work. I just don't know IF they work. And I hope to never know. But I'm ready . . . just in case.
These things are wonderful. I rolled over a shard of glass and cut a hole in my rear tire 7 or 8 mm long. I tried the bullet tip plug, but couldn't force it in the hole. But 2 of the pointed tip size next to each other sealed it in a hurry. After filling it with an CO2 inflator it held air for several days until I replaced the tire. I'll never ride without the handle and some plugs.
I only wish the larger plugs came with a pointed tip.