Is it worth it or not? Grant it the chairs at our venue is actually not bad to begin with. They are fairly plain but they are suffice and serve its purpose. However before I even started wedding planning, I always loved the chiavari chairs so it's definitely on the "if budget allows wish list." I've found a couple of vendors in the area that can accomodate this service.
http://www.coveredaffairs.com/about.html - best priced vendor according to a couple of people I know who've used them.