Anyone used a KeyStone?

I want to move away from Ledger and something like the ColdCard MK4 or ColdCard Q1 looks amazing, the only issue is that it doesn't do other coins.

I want a wallet that is air-gappable, so Trezor is a no-go.

After some research I discovered the KeyStone, it seems to meet all my requirements, but I haven't heard much about them, in contrast to Ledger, ColdCard and Trezor. I was wondering if anyone has used them before?

Once I find a good replacement, I'll update my Ledger to have the same seed phrase as one of my hot-wallets, and just hold a few hundred in there at any one time. The Keystone (or whatever) and ColdCard will be used as air-gapped wallets.