I've on other threads here, and also other forums, as I've thought about these as well.
Some have said that they installed them, but didn't really protect the wheels as they didn't feel the kerb before the protector was ripped off and the alloy damaged.
I'm not certain of how well they mount. Another thread has mentioned the protector flying off on the Motorway - not ideal.
These are mounted by being jammed in-between the alloy and the tyre?
Any risk of breaking the seal during hard cornering losing a bit of air?
Another I'd read jams a razor blade type edge into the tyre - could be wrong. This is a high-stress part of the tyre IMhO and surely that will weaken a potential weak spot?
I've just thrown my thoughts into the pot, possibly unfounded.
I decided just to be more careful parking!!
Then I caught the kerb for the 1st time in 3 years - was so annoyed I refurbed the alloys!! LOL! (True!)
Al.