Wow, these are a trip. Super sure and easy, at least on the trainer. Speedplay says you need to lower your saddle, my first try at it is 1cm lower, I suppose it may go lower still. 

I mounted these up on some Speedplay 4-bolt Lake CX300 Carbon road shoes I picked up on clearance from The Pro’s Closet. Yeah, my curiosity  currently has about a $300 price tag. 

One final observation: the little cleat plugs Speedplay provides with the walkable cleats are a total joke.