We are "practice pumping" with tslim. It was much easier to understand and use than I ever anticipated. I have to say, though, that I still get apprehensive and have a knot in the pit of my stomach hoping I'm not adding on more things to stress about. I read so much about kinks and trouble with occlusions and how if you don't catch it right away all the terrible things that can follow. With shots and Levemir I always know he got his insulin. Gauging by your own personal experiences, How frequently would you say you have experienced occlusion problems?