Well, at this writing, all I know about them is what can be gleaned from their website:
www.shuttleamerica.com

Northeast US regional low-fare carrier using Dash-8's out of smaller regional airports (e.g., BDL, BED).

Considering trying them to Buffalo out of the Boston area. Fares as low as $69+taxes each way for this particular route.

Seem to be an earnest outfit, but would be interested to hear about any direct experiences.

Anyone?

(Perhaps I'll be responding to my own inquiry in a couple of weeks...?)