Thanks for the review. RPM looks blah. There are a lot of other better, cheaper supps out there. The Drive on the other hand...I have no idea. I agree though about having to take it for more than a day to get any idea. Kind of a waste of money to make samples of that. The dosage info for the RPM seems kind of fucked up. It looks like they would do one of those "take a pill a day, increasing each day until you hit a satisfactory dosage up to..." and then put the chart there. If I would only take 2 or maybe 3, then more than double the dose seems like a lot even if you are +220.