I find the %speed slider a little difficult to use. When I move it from 100% to 50%, I can't tell what affect that has brcause the CPS shows an average for the entire transfer, not the current CPS.
WinSCP is a great program. I give it to all my users. I usually stick to OpenSSH because I'm an old Unix guy, and because I want to control my bandwidth.
Thanks for all your work!!