We have some serial consoles by manufacturer Raritan.
More specifically, 8-port and 16-port DSX-8 and DSX-16s.
Currently, I seriously doubt their stability.
What happens most of the time:
Usually, the device isn't needed for some time.
When it is finally needed, I connect to it via ssh and give it the (serial) port number to connect to.
Upon that action it just reboots. And it takes ages (10+ minutes) to reboot. (During a network problem where the console is needed urgently that simply is not tolerable.)
Firmware is up to date.
Support is of no use at all. ("Would you like us to send a replacement?")
(No all of them are doing it.)
Does someone use those Raritan devices?
Either there is something inherently wrong with them or we are doing something consistently wrong.
I seriously consider switching to more serious devices.