it's actually worse for you than a regular burger is.
Health isn't part of Impossible's pitch, and I'm not interested in eating healthily when I'm at a fast food joint. In terms of baseless "if you eat fake meat you'll get cancer in 20 years!!!" speculation: it may make me the target of ribbing but I do trust the FDA's process for food safety, and Impossible meat been deemed safe to eat.
Beyond that, it's a test of human biases. We won't get to replicators on Star Trek if we don't come around to the idea of lab-created food. (We wouldn't have corn or strawberries in their current form either...) All food innovations seem strange and possibly a little disgusting at first.
Bring on the GMO food and synthetic meat! It won't get any better if we're just sitting on our hands, so I'm extremely excited to see Impossible go nationwide with the #5 fast food chain.