bump again...I'd like to hear some people's opinions on this as well. I have never used Clen, but am using ECA for the first time and am feeling great while keeping my calories really low (cutting phase)...only ingesting about 2400-2600 cals a day and have a crapload of energy from the ECA. The energy this stack has provided has made me almost forget how low my cals and carbs currently are. Unfortunately, I have had to cut out the aspirin due to stomach upset, but everything is still working great while just using the caffeine and ephedrine or ephedrine alkaloids/ephedra if you want to be exact.