I love building, but for me flying is a bit more satisfying than most parts of building. Getting out to the range after weeks of buildup, prepping the recovery system, double checking everything as excitement builds, tightening down the closures on the motor as I run a mental checklist of what I did while I was building it, Sliding it into the motor tube and threading on the motor retainer. Then, standing back and thinking "did I do that right, oh yeah I remember" Then carefully loading it onto the rail and connecting the igniter, as all the work put into it up to this time culminates into this, its first flight. That's what really gets me excited. Building is great, but finally seeing my last 2 months of work flying into the sky as flame and smoke propel it upwards to thousands of feet just about beats anything else.