I used it a few months back and I really liked in. In fact, so much so that I bought another two bottles of it. My endurance was pretty awesome and strength increased better than when I was on CEE.
I remember I was running on the treadmill one time after a really intense back day, and I only planned on running for 10 mins, but, I felt like I could run forever so I stayed on for 30 mins, and still didn't feel tired on it.
Like I said, I like the stuff, a lot. It's ashame it's fairly pricey or I'd be my main form of creatine.