Ava has been on the pump now for over three years. We've always used contact detach steel sets. The last few months and weeks though, her sets have not been healing up the way they used to. I don't know if it's that she would be getting scar tissue anyway, or if she is beginning to react to the sets. She's still a skinny minny, so we only use her toosh and arms. I'm thinking of making the switch to a different set to see if we can rotate sites abit more. Though I love the comfort of knowing the site isn't kinked. I'm dreading going to a teflon set and always worring about a blocked site. Anyone have to make the switch? Thoughts?