I've been impressed with it - I've used it to keep my test and real careers separate so that I don't accidently stuff up a real career (not that I play many real patrols - last one finished in May this year!).
For all those SH3 players that have complained about having their separate-SH3-install careers all lumped together under the one \My Documents\SH3 folder, I recommend this tool to you!
(This tool is the reason for the "- Now supports save folder names other than the default "SH3" (will become apparent later)" addition to SH3Cmdr R2.6.1).