If you've never eaten soya before I'd try eating just one first before you start chomping on them regularly. Some people (me included) have allergic reactions to it which make them dizzy and nauseous, it affected me after my veggie missus made a massive soya spagbog which I shared with myself.
I'm sure they'd be great as part as balanced diet, protein bars have their place, especially if you've just trained and can't rustle up a shake, the carbs will be an essential part of the bars because, I believe it aids protein take up in the muscle.