I was trying this out, and didn't mind having to pay a little since I hit the limit pretty quickly during testing. But it hung once and all the sync info was gone.
I looked around a bit more and found SyncBack (www.2BrightSparks.com), they have 3 different versions of Syncing software , the simplest of which is free. I liked interface better than allwaysync too, so I am using this for now.
+1 for Syncback. I have been using it at home and at work (they allow commercial) for quite a while now and absolutely love it. No issues.