Has anyone used Logic for mixing audio to video?

I haven't invested much time in any program so I want to make a good decision because I will need to follow some tutorial/training to get going.

I tried iZotope RX and I like it a lot. Great interface and rocksolid. I imported the large audiofile (that killed Soundtrack Pro over and over) and performed multiple tasks (declick, declip, spectral repair, denoiser etc.) and it didn't crash once. Applying those tasks to an audio file is lightning fast and it is easy to switch between before and after takes.

It would be nice if you could save 'projects' so you can come back to your work later. As far as I know, once you save the changes are applied to the audio file and if you open it again you can't undo them anymore. That's the only negative I found so far.

So all I need now is a good audio mixing application. I am going to play a bit with Digital Performer and see if I can export something to Logic to give it a go.

Pro Tools is out of my budget range.

Yes, Izotope RX is superb - I couldn't agree more.

I've primarily used STP for recording/mixing short VOs (5-6 minutes tops) and cleaning up individual clips sent from FCP, and for those purposes it's always worked well for me (never crashed). Sounds like maybe it doesn't work very well once the timeline gets too complicated - better treated as primarily a waveform editor?