My grandad was dead against them until my mum and her twin sister started walking lol. The first time he lost them at the shops changed his mind.
I lost my toddler at the shops a few weeks ago, in K-Mart. He was next to me, his baby brother in the trolley, and next thing I turn around and he's gone. I looked everywhere for him, had all the staff in the shop looking for him, and it was 20 minutes before someone grabbed him near the front of the store. I was really frightened at this stage - a kid was molested in that same K-Mart store not 6 months ago. Her mother was in the next aisle when it happened.
DS1 was in so much trouble, I was extremely cross with him. he hasn't taken off again, but DS2 is close to walking so I think I will be getting one for him at least.