After avoiding clipping in for months when I first started riding, I finally did. Now a year plus later, I have trouble riding a bike without being clipping in. It feels like your feet can slip off any any time, so you have to ride much more carefully. I really dislike the feeling now.

I set my clip tension pretty low. So it holds me in under normal riding conditions, but if I start to fall over, it pops right out.

I've only ever used SPD's on all my bikes and I wish I would have done it sooner. My girlfriend had the exact same experience. She used to say no way, now everyone she talks to about it, she says you should do it immediately.