5 Wild Buffalo on Yay Social Casino, tried this Wild West slot

Over the weekend, I went out of town with some friends, and on the way, the guys were talking about Wild West-themed slots. I remembered 5 Wild Buffalo, which I’d played a couple of times at Yay Social Casino, because the bison, bears, and lynxes are depicted really cool there. They say there are as many as 1,024 ways to win and a cool 5x4 grid. Can you tell me how the diamond-collecting feature works and if it’s actually possible to hit that Wheel of Fortune everyone’s talking about?

Oh, and I also wanted to clarify something about the medium volatility: does that mean there are almost no streaks of empty spins, or will I still have to sit back and wait a bit for some good bonuses? And in general, what do you think of the free spins with expanding symbols—do they come up often or rarely?