Has anyone used these for a long period of time?

I'm thinking about getting some and was wondering if they really do help with cakes weeping, etc.

What are they?

Theresa

i do remember someone mentioning it previously, but don't remember who. Maybe you can do a forum search for "Cooler King"

check out this search that i did, the top two under your post are the ones i was thinking of. Maybe there is some info in these two threads you can use.
http://cakecentral.com/cake-decorating-fsearch-results.html

so the search i did didn't copy in the link. In the top line on the page that you come to type in "cooler king" then check the second box under it that says "search for all terms" All the ones in the business section will probably have what you're looking for.