Has this workout worked for many people or not?

I'm trying to shed off quite a few pounds. I'm meeting up with my long distance (boy)friend. I'm not sure yet, haha. And I want to look my very best.
How has Jillian Michael's 30 Day Shred worked for any of you? Did you lose weight? Look skinnier? Gain muscle? Or anything? My friend tried it and she said nothing happened, but for reviews on Jillian's website, I see great results for people. Just some advice from people who've tried it would be great. Thank you so much! x