Well I've just had a Mas Bar. And I feel ill because of it. Nothing wrong with it, just waaaaaayyyyyyyyy too much sugar / sweetness, and I'm not used to it. We got two of them on the Mt Mtchell bushwalk, ate one then, and had the same result.
I knew I was going to feel this way, so I ate a preventitive mandarin, and there'll be an apple following soon...
Too sweet. Yuck.