It's not really a hybrid. At least it's not in the sense that the Lexus RX 400h and the Honda Accord Hybrid are hybrids. Like the Japanese (or real) hybrids, the GMC hybrid has regenerative braking and ISG. However, unlike them, it only has a small (42W) battery pack. The sole purpose of the battery pack seems to be to re-start the engine at stoplights and, of course, to power the APO, which will be of use to many tradesmen and farmers. Guys (and gals) who operate electric tools for a living will most certainly appreciate the convenience of the APO, if not the five grand or so extra upfront cost.
It's very comfortable for two adults. but will transport more passengers. With back-hinged (suicide) doors providing easy access to the small but practical-sized rear bench, two full-size adults could sit back there in relative comfort for short trips.