I have hike the grind before and it is just that, A GRIND. Not physically difficult unless you are pushing for a time in particular. The mind game however is absurd they give you false hope with halfway marks and other odd and seemingly off indicators.
Then once at the top, their are bears, beaver tails and a good'ol canadian times. I'd recommend this experience as a great way to get fresh air and goof around on a mountain.
Here is a link with the FAQ's