I replaced my incandescent and halogen, mostly, BR40 size bulbs with LEDs as they've burned out. I started this about 4 years ago and now have about 50 LED bulbs in use. None have failed and all produce light that is indistinguishable in intensity, color and pattern from the bulbs they replaced. They were pretty expensive to start with, $20 per bulb, but the price has come down a lot over time. However, electricity is expensive around here, $0.25/KWh, so it doens't take long to justify even paying $20 per bulb. Mostly I've used Feit and Philips BR40 LED bulbs, but I also have a bunch of Cree and Philips A19 sized bulbs. I'm happy with all of these.
Not having to replace bulbs and seeing a noticeable drop in my electric bill has been most welcome.