Trezor (Model T and Model One - These have actually been the most reliable of the ones that aren't the SeedSigner) Blockstream Jade - the software was total dogshit. ColdCard MK4 (just had one brick for no good reason during normal use after only several months of owning it). ColdCard Q - This one has had issues with cameras picking up the QR code on the screen due to the poor backlight quality. The SeedSigner has worked every time with ease. I have to resort to micro SD transfers with the Q. The QR scanner works great, just not the reverse. One of the PIN entry features also completely failed when I tested it. So much for the best in security. I've spend a lot of money on this shit and the @SeedSigner has been the only one to not get in my fucking way and make using hardware signers annoying.