Not quite true. I've received the blue screen of death on an MX20. I
could not reboot after that. It required a software upgrade. Since that
time, Garmin AT has re-done their entire system, with new (3rd
iteration) display hardware and software. {I've had my display replaced
3 times now: I'm keeping my fingers crossed}

Discussions with Garmin AT engineers have led me to believe that
hardware-wise this ain't your mother's motherboard. For one thing, it
is (supposedly) able to withstand temperatures well over 100 F.