Went up with GMS, East Glacier route. Very windy on top but good to be up there. 2nd time up Bison and have to say the route from Two Med when it's possible to go that route, is more scenic and prefered.
The mountain itself was easy its just being slowed down and blocked by tourists on the Scenic Point Trail that won't move off the path. Bison had good views of the peaks in the Marias Pass and in the Two Medicine Valley. Winds had to be over 50 mph on the summit. Climbed The Head afterwards nice and easy day other than the wind. Climbed in a tornado with Rebelgrizz and JFK.