It's the same for any clipped in system, surely?
My first attempt at riding clipped in was with Shimano SPDs. I set off OK, but rapidly discovered that I could only unclip easily if my foot was below the crank. The further above the crank the harder it got, until I just couldn't unclip. Comedy falls ensued aplenty.


I had promised myself that no matter how hard it seemed, and no matter how many times I fell off, I would stick with it for at least three months. Anyway, 18 months later, it took a three-day ride in the Yorkshire mountains* to finally make me realise that flats were the way to go. Every single rider on that outing was on flats, except me! They had zero problems; I was all over the place; the lesson was not lost.
Note* Not really
mountains as such, they just felt like it. Hill starts so steep that I couldn't get going because the bike started rolling backwards before I could clip in. Very much NOT comedy falls because I couldn't unclip fast enough.