@bala I doubt it would be worth it. But it depends on what you need. If you are simply looking at remote access, then LogMeIn Free is all you would need. If you are looking for features like FTP (File Manager) and remote printing (printing from the remote printer to your location) and speed, then LogMeIn Pro is the way to go. LMI Pro is at least three times faster in file transfers than Himachi. VPNs tend to be slower than most remote connections.
I have heard that Himachi Pro is much faster than the free version of Himachi.
My guess your answer to the last question is that hundreds on here have experience with LMI free version and less than ten LMI Pro version.
