Burn away is just A LOT, to say the least. The serving size is 2-4 capsules. I'm 5'2" 135 pounds- I have to take 1 and even then it's insane. I sweat and sweat- it literally pours off of me. I also KEEP sweating up to 3 hours after, which is why it's too much haha. I then get cold sweats after. It's a little intense. It does however make you focused and really helps push through your workout.
The Anytime burn is awesome. Stim free but such a great product.
IF you can tolerate the sweat then by all means get the stack, if you can't I would stick to just anytime burn.