SynthEyes is cheap, fast and flexible. I use it for recovering cameras from footage, if you're doing mocap or something cheeky then that's out of my experience.

I've used it on every show since 2006, most recently on Iron Man 2. If you have particular questions Russ from ssontech is very helpful.

Syntheyes absolutely AWESOME. Working with it for about a year and the results so far are stellar, especially if you feed it handmade tracks. It's times faster than PFTrack (like: screamin' fast), scene geometry reconstruction is more accurate and it costs very little. We switched from PFT to using Syntheyes on 90 percent of the shots except for the ones where you really need geometry tracking.