Any experience with WS FTP Server 3.x?

Hi dear experts,

our current project requires secure FTP-Transfer to a webserver (Windows 2000).
So far, our inquiries have shown that only WS FTP Server 3.x does feature SSL-encoded FTP.
My question: Does anyone have experience with this product? Is the installation and handling foolproof? I would really appreciate your opinions before I actually take the step to put this software on a mission-critical webserver.

thanx in advance,

rol