I took the plunge, bought the unit.
Continuity/diode and most testing speeds are vastly better than the OWON/Multicomp unit I traded back to them.
Downside though, the GDM-8341 locks the front panel when you're connected to it via the computer :GRRRRRRR:
Still, because I love VFD's so much and everything else was working nicely ( except that buzzer, that's some weak sauce there! ), I proceeded with writing up a linux app for it.
https://github.com/inflex/gdm-8341Couple of things to keep in mind;
1) It's not fully fleshed out yet, I have simply put in enough to get me through over the next week for the work I do ( board repairs ), so volts, diode, continuity and resistance are active selections from the keyboard; trivial to add more
2) You will need to modify the cp210x.c driver for the linux kernel. I'll submit patch for the mainline kernel but don't expect to see it show up in your distro for at least 3 years. The patch is trivial, you simply have to add the VID:PID pair in to the list of devices the cp210x.c supports
3) It's not meant to be a complete front-panel replacement; again, this is just for OSD data purposes for when I'm doing repair recordings / YouTube.