First set is Shimano PD-M520.... these were on my wifes bike and she only tried them twice. She just never rode enough to embrace clipless. I'll toss em in my truck and if we ever meet up at Allaire, Mercer or Wharton you can have them
Second set is Shimano PD-A530... these are only a few weeks old; i used them 5 or 6 times to ride Allaire. I bought them so I could go out for a quick spin without needing my mtb shoes on, but I wanted to get a dual sided spd pedal. $60?
^never really had an issue with those... its more of a confidence thing since my skillset is still pretty basic. A few times i had to hop on the bike and one foot was on the platform side so it wasn't clicked in.... i made it around/through the obstacles just fine but I knew i wasn't clicked in and I just "feel" more confident after hearing that *click*