There are dozens of FIRM workouts now, so there's lots to choose from. I am only personally familiar the Classic FIRMs that originally came out, and those are EXCELLENT workouts, and were groundbreaking for their time.
I'm not as sure about the newer ones - they are actually made by a different company now, but they seem to be pretty popular. You can find out more about them at the Video Fitness Forum, along with reviews.
As for results - I found myself getting stronger and feeling better within a couple weeks. I don't know if I can really speak to weight loss results because most of the time I was using them, I didn't diet, and the time I lost the most weight, I was obsessively counting calories. the VF forum does have reports from lots of people who felt they got great results.
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