I've seen the ingredients in compound 20, pretty much overpriced & overhyped bullshit. As a note for the future, most so called fat burners/pre workouts now contain caffeine (good) and a bunch of other ingredients that are average at best. So yes, taking compound 20 is a waste in general, not just with an eca stack.
In the future bro for these sort of products, unless they contain ephedrine, synepherine, sibutramine, yohimbine or 1dmaa - your wasting your money. Thats not just my opinion, its a fact - they're not even 10% as effective without those ingredients.