Have to say I love CF too. Got a bunch of sample packets at the arnold and definately going to get a tub when I run out of all my samples. Best pre wo I have taken so far, and I have run through a bunch of them. And for once looks like a solid ingredient list and not skimping on the good stuff. Right now I have only used one packet and get a great tingle from the BA and a decent pump with good energy. Usually take 2 servings of most pre wo. Like I said its my new fav!!!