I have heard of it, I know nothing about it, Data Recovery is the one I see recommended the most. I had to use Data Recovery once many years ago on a family members machine and recovered quite a bit, but it was a purchased version.
Try the Data Recovery and see if it finds anything (what have you got to lose? as of now you have already lost data) I would try the trial version and see if it recovers anything before thinking about buying the full package.If it does not recover anything then I would not buy it. Maybe then you might try the Data Recovery trial and see if it can recover deleted files from trash.