I haven't seen the first link, but have been a folder share user for ages, and don't have a clue how I got by without it.

I use the free version, that works fine for me, and the laptop, desktop, and work machine all synch a couple folders to each other. I believe the free one is limited to two folders, but that can include as many sub folders as you have under there, so it's not really a limitation.

My documents, my organizer files, and a ton of other stuff synchs in the background whenever a change is made on one of the machines. The only issue, but it's not impossible to work around, is of course it can't synch a file open and saved on several machines at the same time.

It's so easy to just drop a file into the foldershare directory, and know it will be home when I get there, way before I get there.