Thoughts on Trezor Safe 5 and Ledger Flex:

I like the UX improvements on both devices.

Nice improvements to Trezor's security model with Safe 3 and Safe 5. The addition of a secure element mitigates the old physical seed extraction vulnerability. Also, the chip in the Safe 5 mitigates glitching attacks and has additional anti-tamper features.

Safe 5 screen is slick and touchscreen + haptic feedback work exactly as I'd expect.

Ledger flex e-ink screen is also nice and I really hope the longevity of it is better than what we saw on Nano S devices with many experiencing screen failure after a few years.

On the complex bitcoin transaction signing performance side, Safe 5 is the fastest Trezor yet and is only exceeded by BitBox02.

Ledger, on the other hand, is looking to have worse signing performance than the Nano S Plus. SAD!

Props to both Ledger and Trezor for shipping new hardware that is compatible with existing APIs and SDKs. As a result, these devices were automatically usable with Casa's software! 

 wdym by "signing performance" ? 

 Literally the amount of time that you end up staring at the device while it's signing complex transactions.
https://blog.casa.io/bitcoin-multisig-hardware-signing-performance-2024/ 

 Love the Seedsigner as makes setting up multisig a breeze. They complain that it's stateless like that's a bad thing. Not sure I'll ever need so sign such a complex100 utxo transaction though. 
@SeedSigner 

 got it... 

 I really love the idea of e-ink displays.

Thanks for your work! 

 Casa BitBox02 support wen? 

 Thanks for the detailed notes. I'm intrigued by the UX of the new Ledger e-ink devices, but not yet ready to spend the $$$ to upgrade my Ledger Nano X. Soon though... 

 The Flex needs a progress bar. Signing 20 multisig inputs took a long time. I never made it to the end of waiting for 60. 

 https://trezor.io/learn/a/secure-element-in-trezor-safe-devices

"The Secure Element used in the Trezor Safe 3 and Safe 5 is the OPTIGA™ Trust M (V3)."

Isn't that the one that was just found vulnerable in Yubikeys. 

 from my understanding (not a tech guy), the original Nano S was the most secure Ledger device due to its inability to download the firmware for Ledger Recover. Would you agree with that?