If you get a chance to go, go! It's not the big wild prairie like the ones in South Dakota or in Kansas, but considering they established this place to long ago it's wonderful.
I only saw two buffalo today, they were not together, if you want to see a lot of them I've been told you need to show up very early in the morning. I have pics of the heard from about three years ago, the lighting wasn't too good that day either. It was kinda dreary today as it rained this morning, it rained pretty heavily actually.
I'm going back to the prairie next week, or after knee surgery, whichever happens first. I'm hoping I'll see more buffalo then.