HamShield has some pro's and con's. It is great for a radio experimenter with in-depth knowledge of Arduino, but it is definitely not the cheapest and most powerful radio out there. HamShield is made in America and low volume, while Baofeng is high volume and made in China. Even in a perfect world, it will never be cheaper. HamShield is also considerably bigger and is limited on power simply because 5 watts does not play well in the shield configuration.
In response to codebender: With Google closing out Chrome Apps, it has made our easy-to-use strategy difficult to accomplish. However, there is light at the end of the tunnel -- and that is with Python and Tkinter. I have some examples (and eventual binary distributions) to check in soon.
Gimmick, hopefully not. Its a tool with a lot of untapped potential.