It was 99 cents for a 32-oz Big Gulp (which is the smallest size at my local 7-Eleven...).
The color is orange-red, which is where the Solar Flare name comes from.
Like the Typhoon Freeze, there's a decent Hawaiian punch flavor, but it's scaled back and not as tangy. On the tail end there's a bit of melon to it.
Other than that, it's quite fizzy and not overly sweet.
Overall, I liked Mountain Dew Solar Flare. It's not my favorite by any stretch but it puts together an interesting pairing that's fairly enjoyable.