I tried it. Hated it. Ok for editing MS documents in the cloud but offline/locally via OneDrive was terrible. Had lots of limitations like 5000 files here, 20000 files there which was a problem for us.
Basic test were ok but as soon as you put any stress on it, I had sync errors, it would permanently stop syncing etc. One of my simple tests is 10000 files in 100 folders of 1k each (all 0 bytes). It struggled to handle it.
Apparently MS just released a new sync client to replace the groove.exe client, and supposedly it handles syncing much better. Supposedly the Sharepoint 2016 service also removes the file limitations by indexing in the background differently, and the user doesn't have to worry about the number of files. But I'll be trying your test to see if that's true...
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