Giant Tranny Orgies? Sounds awesome.
On topic: I'm not very knowledgeable about the topic, but from what little I do know I'm against it. With a quick google search I found this:
Institute for Responsible Technology - 10 Reasons to Avoid GMOs
I can't speak for it's accuracy but if those are facts and not biased propaganda, I only need a couple things out of that list to make my decision pretty easy.
Edit: I don't have a problem with the concept of genetic modification, but those side effects on that list are just not worth it to me.