There is nothing more rewarding than seeing your knitting being used, for good of course. My boys don't have a choice - I make them wear what I knit. No questions asked.
Other people, unfortunately, are not under my control. I have come to the realization that knitting something for someone is about the process, and not about whether or not they truly love it as much as I do (this is hard....but I think it's true...). I can't control other people's reaction to my exhaustive knitting efforts. I have to "let go" (again, this is hard....for the exceedingly high strung, type A person that I am....but I'm trying). Knit with love, give it away and let go.
Having said this, nothing feels better than seeing your knitted works on a loved one.
Case in point.
I can't tell you how excited I was when I pulled him from his car seat to see this.
Gorgeous. The kid and the pants.