bp15

I'm thinking about one of these two however I have a few questions, and I only use them for road bike. I tried the Look Keo but rule it out since I had a hard time adjusting to trying to unclip and especially clip back on while starting pedaling and this is just me...so please don't misunderstand that I am putting it down.

1. Which one is easiest to unclip, M540 SPD or Eggbeater or Candy SL? That is one of the important ones for me since I've never used clipless pedals before.
2. When using the Eggbeater, does it hurt your feet when you have to stand up and power the bike uphills?
3. What about the CrankBrothers Candy SL ? Is it as easy to unclip as the other two?
4. Which one is the lightest?

Thanks to all those who will reply.