I use multiple Insync installations on Ubuntu 19.04 w/ Nautilus integration with multiple Google Drive accounts (1 private drive, 1 company drive with a multitude of team shares).
I’m on 3.x since 3.0.15 and with 3.0.22 the only problem really bugging me is the behavior described in my post above. Luckily it does not destroy data but it causes a lot of wasted time manually syncing content that should be synced automatically.
Only other thing I am missing is the Activities section that is still under construction. That does not bother me much though, as quite similar information is visible in the status bar of the app windows anyways.
Currently no other problems and very happy with v3.
1.5 was very unreliable for me since around autumn 2018. Multiple posts to that on this forum. Don’t know yet if I want to laugh or cry but the exact same problem that makes 3.0.22 hard to use currently is bugging me since at least 1.5.5 (see Does not keep Team Drive sub folders in sync since several weeks on Ubuntu 18.10)