My main issue with them is the addition of color additives, sugar and they're high in sodium. Plus, I don't eat meat. But, health wise probably the main problem is what I mentioned about the additives.
The other problem to me is the cost. I can create those same additions, from scratch,with less additives and cost. But, having said all that, if you like them, and are okay with the nutritional issues and it helps you stick to your plan, who can ever say you're wrong?