I'm new around here, having just bought a 2007 GXP. I wanted one of these for about 10 years now... finally got one. So yes, I read plenty of "disappointing" type reviews on these.
I'm not disappointed.
I knew the trunk space was on-par with my F150's center console space. I knew the rear visibility was not "excellent". I knew the handling was just a bit off here and there. I knew the interior was a bit bare.
However... this is not a grocery getter. Not a family hauler. I'm also the owner of a 2013 Camaro, and since everyone knows the Camaro ships without rear windows... the rear visibility of the Solstice is MUCH better than the Camaro. Handling? It's really good. (No, I'm not comparing it to race-ready Ferraris. I compare it to the Camaro.) I plan on getting the stiffening members for the frame. I have the mod bug and have several in place already, and more in shipping, like a dash kit from Remin, and the King Penn windblocker and door sills (damn that metal strip).
This is the most fun car (and I've rented or driven other convertibles and sports cars before) that I've ever driven. I'm tempted to buy a second one, but the only thing more impractical than a Solstice... is two of them. So, maybe I will... one seller nearby has a showroom condition '07 N/A manual with 11k miles.