I always build them. Yes, now you have to consider late-game health implications and that means not delaying medicine, refrigeration, etc., but for corporation reasons I usually force environmentalism on the world through the UN anyways, which--combined with public transportation--pretty much takes care of health issues.
Production cities are obviously good candidates, but your gpfarm is also a solid candidate increasing your odds of generating GEs, which are always good.
However, later in the game pretty much all my cities have them because they have enough health and nothing else to build and the extra production never hurts.
I don't see it as a matter of WILL you build them, but WHEN and my answer to that is: whenever you have the health to suppor them. And that means not delaying the health techs as we used to do.
Furthermore, with cereal mills or sid's sushi the surplus food can help offset the health implications. And they happen to come with the health techs. So keep a GM around (they compete so you can't build both, I prefer cereal mills).