I measure my success by a few different things.
To be sure, nothing will stop me from feeling great as I see those numbers move down the scale.
But, I decided to pick up a few other "successful" feeling habits after reading about maintainers. (After all, I have to stop losing at
some point.)
I have to make it daily. (I'm like a kid... I need this sort of pat on the back daily.) I follow the Monthly Points Challenge and eat healthy, exercise and drink my water.
Increasing the speed and/or incline on my treadmill also makes me feel successful.
Putting on smaller pants.
Knowing that I'm coming up on a one-year anniversary of "lifestyle changes"

(These anniversarys are becoming more important.)