What are the pros and cons of clip-on pedal??

[Flowrider]

I was talking to a mate the other day about clipons.

I stopped using mine for two reasons.
- fell over because foot got stuck
- I mainly mountain bike and that fraction of a second delay in releasing your foot can be crucial in a crunch moment!

A bonus for a clip-on is the ability to up pull especially on an uphill climb

My mate agreed and his solution is to have one clipon and one normal.

Whats your thoughts?