I've done Gakic/Leukic before and saw nothing. My buddy did the whole thing of Gakic/Leukic/Creakic and also saw nothing.

Instead of getting Leukic, you could easily just get some bulk Leucine or even better yet some BCAA's. As far a Creakic, i don't know what they claim to make it better than other creatine, but i would say any other creatine would work. Also, they sell CEE (creatine ethyl ester) in bulk pretty cheap. And for Gakic, there are a few reviews of it here on the boards.