I have one. I went from a 26 inch 456-evo to the 27.5 45650b so feel well qualified to offer an opinion.
It’s a good bike, the frame is long and low with slack angles and once built up makes for a very stable hardtail. Mine has a 150mm fork and feels like it could ride down anything.
But….the 26 inch wheeled Evo had a certain something the bigger wheeled bike is missing.
Riding the Evo had me looking for roots to pop off, the rear triangle had a playful twang or snappiness to it that the 45650b doesn’t have.
The 45650b feels like a blunt instrument, a sledgehammer to crack a walnut…. I can see why Enduro has gone in that direction as the bigger wheels make for a stunningly capable bike and in racing that’s all that matters, I’m just not sure it’s what the masses need for fun trail bikes.
The bigger wheels are of course easy to blame, I’m no frame designer and the dullness from the 45650b could be due to chainstay length, the extra material used in the larger tubing (it has a 44mm headtube for any fork standard and a large diameter seat tube for dropper posts) etc etc…
Anyway, I still enjoy riding it, it is future proofed if nothing else, it’s just that I felt the Evo was the better bike.