Well...almost. I refer to myself as a "recovering ACID user" (man, that sounds a lot worse than it is - I really mean Sony ACID Pro), and I've pretty much divested myself of it, except when I'm looking for a loop in my loop library - I've got over 4,000 loops (mostly drums), and the Media Manager in ACID (the same one is used in Vegas) is hard to do without. You can quickly search and preview loops with it. I use it to locate any loops I need and then copy the source WAV files into my REAPER project folder. (I wish I could figure out a way to launch the Media Manager as its own application!) And, in those rare cases where I need to perform some surgery on a WAV file, I'll use Sound Forge. So, apart from editing audio files and searching for loops, I use REAPER for everything.