I've had no problems whatsoever with it! Only issue is (I think) that last level of brightness on the display because I'm not using the custom Toughbook display drivers. I don't have the resources to do a comparison with another identical CF-19 or swap another caddy with Windows 7 on it already.
I did the upgrade first to send the hardware profile to MS so that my Toughbook is Windows 10 OEM activated, then used a USB key to clean install Windows 10, then the drivers individually.
Almost identical here with a CF-19AFUAG1M (Mk 5). Upgraded 7 to 10, activated, then did a clean install. Same issue with the brightness - I can't get to the lowest level or 2 of brightness, it just goes black.
A few other minor issues/nuissances that I'm still trying to work through, but I think these are (mostly) Win10 issues rather than panasonic issues per se:
- MP4s won't play in the Win 10 'Movies and TV App'. After the 7 -> 10 upgrade, they played but sometimes with garbled audio. After a clean install, they won''t play at all, error message says to check my drivers. It can't be a driver issue because they play fine in Windows Media Player just not in the 'movies and TV' app. But from what I see on the 'net this seems to be an MS issue as a lot of people with various non-panasonic hardware are finding the same.
- It could be my imagination, but the touchscreen *seemed* more stable under the 7 -> 10 upgrade than with the clean install. It's not very 'consistent'. Sometime a mere light touch will do, sometimes it seems like I have to press so hard I'm worried about breaking the screen, sometimes I either have to touch 3 or 4 times or touch somewhere else then come back.
- The 3rd-party app 'GPS Satellite' form the Microsoft Store doesn't see the GPS on the GOBI2000 card. Hardware manager shows an NMEA device on 'COM7'. (COM7 ???) I would've expected com4 but that's where "Intel Active Management Technology SOL" is. And I can PuTTY into Com7 and see the NMEA data stream. But I'm not positive this the original Gobi2000 or even a 'genuine' Panasonic one. The Panasonic "Carrier Select Application" saw it and installed a driver and Hardware Manager seems to like it, though.
Still workin' on it. Overall, I'm satisfied, considering this isn't officially supported anyway. No complaints with overall usability or performance. 8 GB ram and a 250 GB Intel 730 SSD.