I always question LED efficiency. Last time I did a good search for LED bulbs for the house I found that their efficiency was right around the same or worse than CFL bulbs, at least for the more inexpensive LED bulbs.
That being said I have one LED bulb (besides nightlights) in my house. Its a PAR20 dimmable bulb. I couldn't find a dimmable CFL in the PAR20 format. It was expensive at around $23, but it does work very well. However, the efficiency still isn't stellar compared to a CFL bulb, but it is much much better than the halogen it replaced.
I did a quick little review on it when I first got it.
http://ecorenovator.org/forum/lighti...ght-today.html