The thing that works really well for me when taking RPM is to take it before you work out, and then eat some food about 30 minutes later. I like to jump straight into training, you I may still be a bit hyper depending on how many caps I took/ if I've had any other caffeine that day. If that is case, I eat a little more (some almonds or something, nothing too major) at the very beginning of the workout. By the time I'm done stretching, I'm good to go.
When it equalizes though, it leaves you with good, focused energy. N.O. Xplode, energy drinks, Redline, etc don't have this. When they wear off, they just wear off.
As far as the pump goes, I would definitely say that it is temporary. You'll see a difference in pump depending on how many you take, and its usually gone in about 6 hours or so of inactivity. I've recently added Creatine in to my supplement regimen for recovery, and have, incidentally, put on some of the crappy, swollen muscle water weight.