On Thursday, I saw two identical black Cadillac CT6s. One was in a valet situation at the curb and the other one was driving by. Both had 3.6s and the one at the curb had AWD. I will say that the rear lights which slope slightly outward are one of its best features. It's a departure from the always too vertical Cadillac finned look. I like the CT6 from the side and the rear. The front is okay but that long extension of the front lamps into the fender is a little odd.
Today, I saw a black Range Rover. Never mind the vehicle. The driver, an Italian looking heavy set thuggish type, had a small white poodle in his lap while driving and with its tiny head out the window. In addition to being an atypical sight, it's not a good situation for the dog. What grade did this guy get in driver's ed? I wish dog owners would let them look out other windows in the car and not sit in the drivers' laps. He was perpendicular to me at an intersection. Had I been walking in the intersection, I would have told him something.
As for the OP, I think it was hit and miss as to which '76 to '77 GM full size conversions I liked. I know that I liked the smaller Pontiacs and Cadillacs better after that refresh. Probably the Buicks, too, with that Riv hatched from the LeSabre platform and for which its grille was referred to as the Parthenon. I will always love the '75 and '76 Bonnevilles and Grand Villes in big coupe form, though, with a landau roof and base Pontiac rally wheels. They were the only division that could pull off the big coupe. I would love to know what driving one of those would feel like. I once saw one in Yosemite in November back in the day and it was beautiful. So was Yosemite!
I think that the '77 to '78 refresh of the GM intermediates was sort of lame. The GP and MC needed to shrink, with the GP looking okay and MC looking cheap afterwards. The Cutlass Supreme and Regal were so-so, with the fastback sedans being a total styling disaster. It wasn't until 1981 that all 4 of those were fine tuned and looked a lot better ... a lot better. Even the entry division MC looked great when outfitted in buckets/console or with the 60-40 LS seating, full instrumentation, and the unusual "racing flag" alloy wheels.