Very, VERY nice!! I test drove a G8 GXP about a month ago (had to go for the top) and I was quite impressed! Very comfortable, very strong handling, and lots of power. It was the GXP after all.
If I had to get a sedan, it'd be between that and a Malibu. Either way, GM baby!
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Current: 2014 BRM 2SS/RS 1LE w/NAV, NPP, Recaros
Former garage: 2010 IBM Camaro 2SS/RS 6M
2011 Avalanche LT