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And I certainly wouldn't use the script you found. Try to find one that stays on your site. There are lots of them.
five years on a 400 unique visitors a day site. In those years about 25 people actually used it
I think that it very much depends on the nature of the site. I have one on a site which has information of a kind that people are likely to share, and it is used a LOT, several times a day with 1000 - 1500 daily uniques.
I agree you need to find a script that you can host yourself, one that has at least some protection against it being used for spam. There are loads at Hotscripts in all flavours.