Wow, I thought I had the only 3 yr old that would run off at the drop of a hat. I'm feeling a lot better about that after reading this thread.
The first time I saw a harness was pre kids at a red sox game. A mom had a daughter with one one and every time she wiggled or leaned or strayed even the slightest, the mom would pull on the leash like she had a dog. It was then and there that I said no harness. Of couse pre kids I also said, no pacifier, not tv. We just weaned my 3 yr old off his paci and guess where the two kids are now? Watching "Wonder Pets".
So, I realized a lot of why I said I wouldn't do things was partly b/c I didn't know better, and partly b/c of what I "thought" was right based on what others said or I thought they would say or think.
We are planning a May Disney trip and at first I said no harness. I thought about it and realized it's because I was worried about what others would think. After much reading on these boards. (The harness quesiton comes up quite a bit). I realized the best choice for us is a harness.
I absolutely agree in being firm, setting boundries, etc. And for the most part it does work. But I just can' take the chance of him squeezing through a crowd to never be seen again. For my son and our family..I think it's the best thing. So our two sons will have the choice of stroller or walking with the harness.
I wanted to comment on the wrist things. Keep in mind...as I've read elsewhere..that's it's very easy for a child to dislocate an arm with those if they get ahead and trip or get tangled up in a crowd.
The OP might also want to consider what I've read here somehere before as well. Someone suggested going to the pet store and getting a cat collar and leash for the childs wrist. That way the child can pick out the colors and designs and you can get a better fit..like a bracelet. But there is still the risk of an arm getting pulled.
Anyways, harness or no..it's an individual choice. For me, the more I thought about it I realized it was a matter of safety. And it's not hurting the child. I probably wouldn't use one in the mall or at home or at a red sox game. But at a large theme park-I just can't see risking it.