This thread has done an excellent job of not turning nasty... yet! There are those strongly against it and those who wouldn't dream of not using it. Terrific! We all have different parenting styles and no one is right nor wrong - just right or wrong for YOUR family. Please... let's keep this civil.
I think there is also some great advice about how to use them:
- test them before you go => practice is great for the kid and the adult
- don't use it as a replacement for paying attention, use it as an extra measure of safety
- watch your child - don't tug on their arm, etc. and pull them backwards
- don't let them 'run free' and have the strap part (I tried to avoid 'leash' since that inflames some!) between you and other adults, wrapped around others, lampposts, etc.
Personally, I would think in a large crowd (think parade time, entry, etc.) that it would be hard to use - I'd rather have a hand or a stroller. I'd be afraid of becoming twisted/wrapped around others. However, in the 'open' areas - the lands, etc. where you can walk more freely, I could see the benefits.
So... be smart, use your brain about situations, you'll do great!