Have to echo the "might not see much change on the scales" message but demo worth it if you want to get smaller not just lighter.andgis the most comments on how much weight I had lost during the time when I was losing the least weight and I think it was because I was doing lots of exercise so toning up. I did feel much better about myself and about my figure even though the scales werent telling me what I wanted.
my top tip is it get someone to help you take regular measurements, as you will see they shrink even if the scales don't reflect that. Measurements to take, obviously bust, waist and hips but also arms and legs (just remember to take them from the same point I.e. 1 inch down from the armpit etc or whatever).
As has been said muscle burns more calories even at rest than fat does so long term it will help with weight loss. For me though the best bit of it is I feel thinner, toned and more confident.