I believe I don't use this to its full potential. But I use it to upload project web content to sourceforge.net, and for that OpenSSH works great!
It ruins the system path on Windows 7. After install only C:\Program Files (x86)\OpenSSH\bin is in system path.
Pleased and relieved to report that installation of the client only did not hose the PATH variable on windoze 7. YMMV
Per other comments, be sure to remember to backup your PATH variable first!