These were fairly easy to install on a set of Mavic and also a set of Fulcrum alloy wheels.
When the tires went flat due to a slice they definitely got us both home.
Performance on a catastrophic flat was amazing.
The problem comes in getting them off.
YOU MUST HAVE THE REMOVAL TOOL. Even then, I had mixed results. On the Mavic set I finally got them off after a lot of struggle. On the Mavic set I was out of town and tried a few methods suggested by a mechanic. I destroyed both wheels trying to get them off. Finally got them off after first getting them unseated and then leaving them for days to allow excess air and sealant to escape. Unfortunately, I destroyed the wheels trying to get the tires off without the tool. Unfortunately, removal is so difficult that I will no longer use these.