Who uses them and please give me any pros and cons. I am only comfortable riding in my 4E new ballance. Will the grips inhance my riding capacity?

Pro's? The $20 price tag comes to mind. Yes, they do work and like anything else they take a little adjusting to make them feel just right. The only con I experienced was forgetting to stretch my hamstrings, keeping me off my bike for 2 weeks.

Give them a try, there not perfect but they do the job.

Bob

I bought some last year, they were in a reduced bin at a bike shop. Paid $10 for em. But then I never installed them. I'm not sure I feel the need to use them. Do they help alot or just a little? I really don't have any trouble keeping my feet on the pedals.

you also gain POWER by being able to push and pull the pedals (I'm sure there is a better explanation) so really just keeping your feet on the pedals is a secondary reason to get Power Grips.

Cons:
MAY cause numb/hot feet, due to restricted circulation. However there seem to be lots of people using them with no problems.
A little harder to get into than 'click and forget' systems
not quite as efficient as clipless - slightly reduced ability to 'wipe' feet around the bottom of the stroke

Pros, that I can think of:
$20
easy to get feet out
Don't need fancy shoes/pedals combination, can use regular shoes

Overall, I think they're a good compromise for anyone who is afraid of being clipped in, or who is reluctant to get new shoes to go along with new pedals.