I do not have any LED bulbs, but some friends do. They received a few from their power company as a promotion. As far as they are concerned, they are no different that incandescent or CFL bulbs, as far as day-to-day usage is concerned. Of course, they don't really notice any energy savings because they only have two or three of the LED bulbs.
I do have two small nightlights that are each powered with a single LED. Like my friends, I received these from a promotion my power company was running. I don't notice any flickering, and they give off plenty of light for my needs. What is nice about them is, unlike my old nightlights, I don't have to worry about buying little nightlight replacement bulbs every couple of months.