Is pilates good for weight loss and firming?

I do pilates 3-4 times a week, I have been for almost a month now. I haven't lost drastic weight, but I think part if it is because I've been building muscle. I DEFINITELY see an overall change in the look of my body, less flab everywhere.
Videos I highly recommend (I do them all through Netflix Watch Now)
Anything with Ellen Barrett in it, to me, has been great.

Pick Your Level: Weight Loss Pilates
Crunch: Pick Your Spot Pilates
Crunch: Super Slimdown (this is my favorite video)
10 Minute Solution Rapid Results Pilates