I have just started using clipless (I had clips) I am faster, though there are other factors involved there, weight and fitness, tyres, tyre pressure, gearing.
I struggled getting into them initially, and whilst still not first time its getting better, never had a problem unclipping (again I think due to using clips) the one thing I have notice and this goes back to being more connected to the bike, is you can feel any transmission faults ect. through the pedals, I built my own cassette from two different ones, and you can tell the difference between the gears.