After many tries, and even after purchasing Syncdocs, I have to say goodbye to it.
Yeah, it's a good software. It has a lot of options, but it just doesn't work quite well. For what I can see, Syncdocs is a program aimed to power users of Google Drive. Well, not really. After Syncdocs took a straight and full 3 days to upload my files (~250k), every time Syncdocs started again (for example, after a reboot) it took ~20 minutes for it to check file consistencies. Official Google Drive takes ~6 minutes.
Also, I was facing an issue when updating files to which I never got a response. I even think that some of my posts are hidden, since I can only see them when I am logged in (thread: http://www.syncdocs.com/forums/topic/any-way-to-speed-up-syncdocs).
I reported that after modifying a single file, Syncdocs does a full re-scan (even after re-enabling the "allow duplicate file names") so it takes ~15 minutes to upload a single new file. It doesn't matter its size or where is it located, it always takes that amount of time because Syncdocs resets to "initializing", then "querying google docs" (takes ~10 minutes), then "preparing google queries" and finally uplading the file. The official Google Drive takes less than 10 seconds to detect and upload the change.
My initial purpose for Syncdocs was to allow me to have external folder synchronized. Yeah, it works that way, but productivity takes a very great hit when you have to wait quarter an hour to upload a 15Kb file.
I ended up concentrating everything into a single folder which the official Drive can scan and sync. Yep, official Drive lacks a lot of options and has glitches of its own, but nothing close to problems that would affect productivity.
And I understand that maybe the official Drive uses a different/faster API, but I was asking for something that other (non-official) programs already offer and accomplish: incremental instead of full sync. Syncdocs was not capable to offer this for me.
Thanks, and goodbye Syncdocs.