I was a Adobe Audition user. The version I had wasn't working well with new versions of Windows, so I sought out alternatives since the new version of Audition was just way too much for me.

Reaper took some time to adjust to, but it's great! Plenty of tutorials and documentation, actively supported with features and bug fixes, and VERY reasonably priced.

I know a lot of people that use it and are happy with it.