I've used G64's for approximately 25 years, and it's a great motor. The thrust curve of the G64 is nearly perfect in my opinion. It hits hard and can have a 2-pound rocket moving at very stable speeds (45 ft/sec) at the end of a 5 or 6 foot launch rod. After the initial punch, the thrust tapers off due to the C-slot grain design, providing a nice, long sustaining thrust. The only downside I've encountered with White Lightning propellant is that it can be difficult to ignite at times. A thermalite booster can be helpful in this case.