Thoughts on the KeyStone 3 Pro HW wallet?

I’m looking to get a new hardware wallet for both BTC and alt coins. As the most popular choices, I’ve first looked into getting a Trezor or a Ledger, but there are things I hate about both.

Although Ledger has native support for nearly all of the alt coins I want, and seems fairly user-friendly, the fact that they’re not fully open-source (AND seem to have a major f*ck-up every few years that destroys trust even further) and invade your privacy in the Ledger Live app with trackers is pretty concerning to say the least.

And although Trezor is open source, their alt coin support sucks, native staking in the Trezor Suit is limited and they don’t let you choose your preferred validator + take they a commission (even Ledger lets you choose your own validator!!!), they sometimes discontinue support for certain coins, and have a small screen size, which means that even if you’re not blind signing transactions (strictly speaking), it may be harder to fully comprehend what you’re signing in certain cases.

Plus, none of them are air-gapped, which isn’t a “must”, but it’s definitely a “nice-to-have”.

In an attempt to overcome the issues I have with the Trezor and the Ledger, I’ve started looking into other wallets – and I’ve come across the KeyStone 3 Pro.

At first glance, it seems like everything I’m looking for in a hardware wallet, and seems like the PERFECT wallet:

Open source firmware

Fully air-gapped

Large screen and user-friendly interface

Support for almost all coins, chains, and tokens

It also has extra security features

Plus, it has a pretty reasonable price (compared to competitors)

BUT after digging some more, I’ve come across a few potential cons:

It’s made in China, by a Chinese company (maybe not an issue on its own… then again, maybe it is?) – I’m mostly thinking it may be tampered with before shipping, it might have a built-in backdoor, pre-loaded seeds, or maybe it’s not using true randomness when generating the seeds.

Its reviews on Amazon are… not great. Not great at all.

I can’t find information on whether they’ve open sourced their hardware as well (like Trezor did).

Obviously it’s newer than Trezor and has a MUCH smaller user base, so despite being open sourced, there’s a higher chance of potential unnoticed errors, backdoors, and security flaws.

I guess my questions are:

What’s the community’s overall opinion of the KeyStone 3 Pro wallet?

Are there any pros/cons (especially cons) I’m missing?

How concerned should I be about the cons I’ve listed?

And does anyone have actual experience with the KeyStone 3 Pro? If so, what’s your take on the wallet?