I have some GU10 LEDs ( 20x 5mm LEDs) bulbs in the 2 "corridor" bits of my hall. Those are really only supplementary lights and there is a main light. They are supposed to be equivalent to "8w" whatever that means as there isn't an 8w halogen rating nor CFL. They are dimmer than a 7w CFL GU10.
My study uses 4 of these LEDs and is "bright enough" although it is a small room. 4x 7W CFL GU10s were really a bit of an overkill (but not as much as the 4x 50w halogen of the previous owners
). The LEDs aren't bright enough for task lighting say in a kitchen, but then again what do you expect for less than £2 each.
A bar is was in last week was entirely lit with the Luxeon 3 LED GU10s and each LEDs is (I think) 3w each. I hadn't noticed until I looked up that they were LEDs and the colour temp was as good as a halogen (unlike a £2 example). Those however are at least £20 a pop ( it's a while since I looked at the prices) so again you get what you pay for.
For low energy lighting, certainly at "domestic" prices, CFL still reigns supreme over LEDs. However LEDs are fab for Christmas tree lights!
Much better colours than bulbs.