Speaking of sales successes, the Solstice out-sold the Miata in the United States for the 2006 model year. It was in either Motor Trend or Car & Driver--can't remember which (both are on my coffee table right now). If anyone wants, I could look up the exact cite, but I definitely remember reading that.
And the Solstice GXP handily beat both the 350Z roadster and the BMW Z4 3.0si in a Motor Trend shootout. Not bad, considering it was the cheapest there (and 60% of the price of the Bimmer).