Faux Burger

Has anyone tried the fake burgers yet? I tried one a few weeks ago, and I could definitely tell it wasn't beef, but it also wasn't too bad in the taste department. There was an article (actually an infomercial) about a week ago that said we should avoid them, but it was pretty clear the author wanted to sell a product.

Any nutritionists out there weighing in on the merits of the fake burger?