i tried these the other day thinking that they'd be more substantive (like one of those nutrigrain-type breakfast bars, but with extra protein in the form of peanut butter). plus, i love pb&j sandwiches. these just don't pass muster to me. they don't have much peanut butter flavor - or peanut butter in them, as far as i can tell.
one real plus is that they are pretty tiny in size (about half the size of a regular-size breakfast bar), so you can eat one plus some yogurt for a nutritious, not too caloric snack.
*note: i had the strawberry flavor