Here is a beautiful photo of one of NYC's most well respected chocolate bars.
The quality of the photo roughly matches my indifference towards the bar. We've talked about Mast before. There's nothing wrong with the quality, but they go for a fruity profile that I'm just not that into. The nibs definitely help, though, and this is my favorite Mast bar.
Bottom Line: If you like nibs and fruity bars, and want to support the local bean-to-bar scene, go for it. But you can definitely do more chocolatey for cheaper.