There are pros and cons and I agree with Vickster, the benefits would be mainly felt on dedicated fast rides not in stop start traffic.
I disagree with those that claim they pull up to any noticeable level barring honking out of the saddle on a steep hill.
Something that is noticeable is that people often move from pretty basic flat pedals and any old pair of trainers, to clipless/straps and cycling specific footwear. In that scenario you will notice quite a difference especially on fast rides. However if you were to use some decent(not necessarily expensive) platform pedals with pins and trainers, cycling specific or not, with grippy soles(it is possible to have these soles added to any trainer for about £35-40 a pair) - then I think the differences would be far less distinguishable.
With the latter combination it's certainly possible to 'pedal in the little circles' that you read about and do the scraping muck off the bottom of your shoe on the back stroke. That movement, coupled with the forward/downward pressure of the lead foot, leaves precious little room for any sort of pulling up in the stroke. But you can lighten your back foot on its way up, coincidentally this is the level of 'pull up' attributed to top road cyclists.
Ultimately, IMO, it comes down to what you want to achieve in cycling and if you are comfortable being attached to the bike in this manner. I'm not and my cycling ambitions don't require clipless pedals to be reached, if that ever changes I will revisit my ideas. I prefer the secure knowledge of being able to hop on any of my bikes with any footwear(though I no longer recommend flip flops
![Blush :blush: :blush:](/styles/default/xenforo/smls/blush.gif)
) and knowing that I will never fall off due to a clipless moment.