For syncing between computers I use the free version of GoodSync.
http://www.goodsync.com/download.htmlAlthough the Pro may be auto sync this version must be done manually.
And of course no size limit.
You have to set your syncing folders to share in order for it to work on a network.
But I do use syncplicity between two computers, cause I can.
It monitors in real time any changes and it's fast, but slows if you are runnning other programs giving syncplicity a backseat to whatever you are doing. But it is still syncing till it's done. Even if the computers are shut off and back on, it will resume automatically where it left off.
Then there is XDrive from Aol that can do syncing.
It's a 5gb capacity for free. Not sure about between computers though. I haven't tried it.
I'm not interested in Microsoft products for this kind of thing.
Though they have them, they dump a load of extra files on your computer with their 'Live' stuff. My experience anyway.