Yes, actually. I find that for most mixing purposes, I like Reaper much better.
Reaper is better for monitoring your levels; there are a lot more level gauges, so you can tell exactly where things are clipping.
Reaper edits non-destructively. When I did a CD in Audacity, there were at least two occasions where Audacity delted all my data files for no apparent reason. Reaper only deletes all my data when I explicitly tell it to.
Reaper has better plugins and effects. There are a lot more, they're usually better made, and there seems to be much more community support for them. Plus, Reaper comes with
the JesuSonic plugin programming language, which is pretty sweet. (I've automated some of my favorite Audacity tasks into a single effect I can turn on with one click.)
That being said, I still use Audacity for some tasks.
After I finish a track in Reaper, I'll run it through Audacity's volume effect since that's a much quicker and easier way to turn the whole track's volume up to just below clipping.
When I need to do quick, simple changes to an audio file (adding one effect that both systems have, deleting some dead air, etc.) I'll often use Audacity since it's a little faster for those kinds of tasks.
All in all, I highly recommend upgrading to Reaper. Audacity has its uses, but Reaper is usually better.