15lbs is NOT a drop in the bucket! It's a great accomplishment on the road to more great accomplishments. Keep up the good work!
I love Tae-Bo too but please be careful doing the stances wrong as you can really hurt yourself. They have an instructional one that takes you step by step to make sure you are doing each move correctly. I'd hate to see you get an injury and have to slow down your journey when you are doing so well.
I also love JM30DS. It's freakin awesome!!! AND no funky moves to figure out