I have always used WinSCP to copy file to/from linux based systems.  I recently setup a VMware ESXi 5.0 server in my home lab and found myself needing to sometimes copy large files like ISOs or VMDK files to and from the server to my PC.  I have heard that FastSCP is much faster then WinSCP and some of my copies were taking 1+ hour so I decided to take a look.

What I found is that FastSCP is indeed faster.  Not just a little bit either.  I think their claim of 6X faster is actually pretty accurate.  I found that to copy about 40GB file using WinSCP took about 1 hour.  The same copy using FastSCP took only 8 - 15 minutes on average.  See image below:

As you can see from image above FastSCP is pretty fast.  It definitely uses the bandwidth available more efficiently.