Sorry, this is long...
I haven't done any Tracy Anderson workouts (although I did get her Dance Aerobics DVD as a birthday gift last week; it looks really fun, upon previewing), but from what I understand there are some mixed reviews on her "Method" and a lot of controversy over her business practices and knowledge about training. She says a lot of really archaic and dubious things about fitness, like that women should "never lift more than 3# weights" so that we don't "bulk," etc. In any event, I would choose to ignore a lot of her dogma on exercise science and would just view her workouts as a way to add more variety to a routine, as she focuses on very low weights and very high reps, unlike Cathe. Clips of her videos are pretty much nonexistent, but you can at least see a butt and leg workout she created for Gwyneth Paltrow for free, here:
http://goop.com/newsletter/16
I have Squeeze Stronger and I like it. I'm doing a Squeeze-heavy rotation right now, actually, in an experiment to see if it gives me some positive changes. For some reason I always think of this workout as not as tough as a Cathe, but when I'm doing it I realize it's nicely challenging, every time. The DOMS speaks for itself! Tracy Effinger also uses low weights (as she does in the original Squeeze, which I also just got last week as a gift and have previewed), and goes for high reps. I had to go buy 3# dumbbells for the first time in over 10 years of working out, just to get through Squeeze Stronger. Who knew those little baby weights I always sneered at could feel so heavy? I recommend Squeeze Stronger, and can't wait to work Squeeze the original into my rotation, as well.