Go to the FIRM YaYa board. You can find plenty of reviews on their forum. You may have to register first on EZ Board.
http://pub129.ezboard.com/ffirmbeliversfrm22.showMessage?topicID=4948.topic
My opinion is that the new series is 'okay'. It's not bad, and it's not great, it's a decent workout series that may give you some positive results. I like the Emily tape best. The others didn't really get my heart rate up very much. Overall, I think this series is targeted more towards beginner/intermediate exercisers. I didn't feel much with the tapes in their pure form. I had to lift heavier weights.
If you've been working out with Cathe for awhile, you may see some benefits to changing your workout style. I've heard about some people who say they hit a plateau with their current exercise program, and needed a change of habit to break the plateau. The FIRM may help you do this.
The FIRM workouts are not nearly as intense (high impact) as Cathe, but if you go heavier on the weights than what the instructors show, you should be able to get your heart rate up. The down side is that the new FIRM series costs ~$90. I think that's a little pricey, considering what you get, 3 tapes/DVDs and an 8lb body bar, but again, this is just my opinion. I wish The FIRM had made the bar heavier, but oh well. Oh, and there is NO chaptering on the DVD.
If you are just looking for a series of tapes that can help you lose a few pounds/inches. I'd recommend Cathe's Intensity Series. I don't know if you have this already. I think Cathe's tapes are much more thorough than The FIRM, but maybe I'm a little biased because I've seen such outstanding results from using Cathe.
Also, whatever exercise program will be enhanced if you also adopt a clean eating program, and drink lots of water.
Good luck with whatever you decide.
Lisa