Although I have used much more potent stims and preworkout mixes, RPM is an excellent supplement in my arsenal.
What sets RPM apart is the ability to adjust dosages according to my hectic schedule. If I work out in the morning, I can load up on 5 or 6 caps and blaze through my workouts.
If I have a marathon case load at work and can't get to the gym until 7, I can take 2 caps of RPM and sip on a non stim mix or nootropic without interfering with sleep.
Although it's very en vogue to have an "X2" or "Extreme" version of products for marketing bologne, I ask you to kindly LEAVE RPM AS IT IS!!!