You talking about these:
https://www.amazon.com/Pure-Protein-Variety-Chocolate-Peanut/dp/B01126O3OY/ref=sr_1_3_a_it?ie=UTF8&qid=1488059942&sr=8-3&keywords=Pure%2BProtein%2BBars&th=1
Those are actually a pretty well trusted name in protein supplementation. The only negative I know of is the amount of sugar alcohols contained in them. If you were to too many bars too soon together, it could cause abdominal discomfort or diarrhea. Nothing too horrific, but we used to have a saying amongst the vets here, "Never trust a fart". It was because a lot of the foods we start introducing can cause that reaction. So I don't think there is any reason to doubt the validity of these bars nutritional claims.
I cycle through my bars pretty regularly. These, Think Thin, Kirkland, and Cliff Builder Bars. Every once in a while I'll get a Met-RX too, but those are complete meal replacements, 400 - 480 calories!