I've had to use an old copy of Rescue Pro to recover some files recently. Since the copy that I had wasn't a Universal Binary(a Mac thing), it was slow and the graphics were buggy. I could make out enough to use it though. It saved all of the CR2 files that I recovered with a .tif extension, but did recover them and they worked as raw files. I'm sure that the newer version would work well enough. I'm not confident that these apps that tout deeper recovery features can really do any more for me. All that I really need and expect out of this sort of thing is to get pictures off of a formatted card. If they have been written over after formatting, then I don't think that there is anything that is going to recreate them.
I was thinking of just buying some new CF cards, because I need to do that anyway. I do like the disk image feature of RP Deluxe though. That way if I needed to recover images from a card, I could save an image of the card and keep shooting.