My riding buddy has had a H-D Heritage Softail Classic, GoldWing, and now a BMW K1600 GTL. His favorite by far is the BMW.
He is a more aggressive rider than I and can make that bike fly through the twisties. He does all of his own basic maintenance (oil, filter, tires) with no complaints. Well, I take that back. The specified Michelin tires are relatively soft, so he burns through tires rather fast, especially the rear. He had a few mechanical issues early on, all covered under warranty. I do know he has spent less $$ maintaining his bike than I have on my 2015 CVO Road Glide Ultra. As I recall, he’s got about 25K on it so far. We have swapped bikes for ~50 miles or so, and it is a night and day difference, with the BMW being lighter and much more responsive, performance wise. We tour together and he has almost as much storage capacity as the H-D.
If you want good assessment of the BMW, go over to their forum. They are pretty blunt about the good and the bad. And go test ride one. I was considering a change last Spring and test drove the K1600B Grand America and the new GoldWing. Both performed amazingly well, but lacked the storage capacity of my existing bike. The K1600 GTL has considerably more storage than the Grand America. But Both bikes are a little too fugly for this long-time Harley rider. I ultimately decided my RGU could satisfy my needs for a couple more years until something really catches my eye. But if it were practical to have both in my garage, I would buy a BMW in a heart beat.
Good luck in your decision.
Some folks seek the comfort of the straight and narrow. Me? I prefer the twisted road.