Gravel/CX Rimpact tyre inserts

https://www.rimpactmtb.com/copy-of-dual-density
Has anyone used these? Thoughts? They same insanely expensive to me, though if they save a nice tyre or rim I guess they've earned their money.
Has anyone used these? Thoughts? They same insanely expensive to me, though if they save a nice tyre or rim I guess they've earned their money.
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https://www.vittoria.com/us/en/technology/air-liner-road
I had tubeless road tyres for a year, but I was always nervous of getting a catastrophic failure and having to try to fit a tube at the roadside. This looks like it might address most of that risk - but at a cost...
They also do gravel-type ones but only got up to 40c tyres.
Various sizes available.
I think tannus do something similar as well.