Downloaded and installed the Cisdem DataReconvery, then tried it. Here is the result of my trial:
1. Easily install and use. when I download the DMG files, I double clicks it, then it installed. Noticed its interface, there are four parts: Document Recovery, Media Recovery, Archive File Recovery, Universal Recovery. I choose the Universal Recovery.
2. Can choose the formats which I want to recover. click "Setting" and see a lot of formats which I can accurate the recover format. when I click Scan, it begins work. Notice: the scan may take 20-30 minutes. I think you could drink a coffe during this time.
3. when the scanning finished, all files found are properly displayed on the left in categories and formats. Before the reocvery, I could preview the files. I think this is good for me.
At last, I got what I have lost.
Maybe I said wasn't detailedly. May you could try by yourself!!