I don't drive an Enclave (not an SUV fan), but cars are what I do for a living. Fantastic to hear that your friend came out OK in the accident, but I'd take the "saved her life" thing with a grain of salt. Most cars these days have very strong crash structures and perform very well in very serious accidents, so the Enclave wouldn't be the only one to get that kind of praise. The Enclave scored very well in crash testing, which is a wonderful thing, but it's not alone.
Other than that, the Enclave is a rebadged Chevy Traverse, GMC Acadia. The Buick is higher priced of course, because it's trimmed out with a few more luxury touches than the Chevy. Overall, they're very competent vehicles, with the Buick really having a nice luxury side to it. Very quiet, comfy, good cargo space. Quality is going to be typical GM, which is to say not fantastic, but not horrid. I do like the interiors in the modern GM vehicles, and the Buick is quite nice specifically. They'll handle competently enough, though as with any SUV a high center of gravity is never a good thing. They're quite heavy and quite large, so be aware of that. Design is obviously subjective, but I think it's a nice looking vehicle. It uses the corporate GM 3.6L V6 engine, used in many other GM vehicles. It's been known for it's share of issues, so be aware of what your warranty coverage is. It doesn't mean you WILL have issues, you may go 150k trouble free miles, but the 3.6L history wouldn't suggest you will.
Overall, I'd say the Enclave is the best of the GM trio of Traverse/Acadia/Enclave products. Competent, quiet, nice overall.