Guys - I've been using this over a year. It is truly one of the most convenient software on my PC / Laptop / Workstation / Home PC (yes, all 4).
I use it for backup and file synchronization.
I used to pay for the professional one - around $50 a year. Now it's free and they actually refunded me the unused months. The free version now is equivalent to the professional (paid) version a few months ago.
I'm sure they will start charging again for it soon... part of Windows Live. I'll probably still pay for it.
No VPN needed, just Internet connection. No worries of security as it's all securely transferred. Better than off-line folders.
Some kinks.. like same file changed on 2 places... etc. But that's to be expected for a program like this, and it's not really the program's fault.