I've tried many, including Foobar (couldn't figure out how to use it) flac to mp3 and few others. They all had what I considered to be fatal flaws. I couldn't figure out how to use them, they required advanced knowledge like Perl programming, they couldn't maintain the original folder structure or they left the mp3 and flac files all mixed together. Finally I tried dbPoweramp. That was the one. What you do is copy all your files and folder structure over to another drive or part of your drive. Configure what type of mp3 file you want tell it to maintain original folder structure and to delete the source files. Start the conversion and several hours later you can have 1000's of files converted, still in the orginal folder structure and no having to seperate the mp3 from the Flac files. The easiest, most user friendly program I could find. It's free except after the trial period you have to pay something for an mp3 license, something like that. I don't remember the details. But if you consider how many, many hours of work and frustration it saved me it was cheap. Also, it is a good program for editing FLAC tags in large numbers. Almost as good as Creative's software is for editing mp3 tags. That is the standard in my experience.