They last at least 50,000 hours which translates to about 20 to 25 years. There are no bulbs to replace in the down lights when they burn out. You replace the entire fixture which I assume will be even more efficient by that time. The down light fixtures are about $100 and 60 watt equivalent replacement bulbs go for about $18 but that is about half of what they went for a few years ago. The biggest problem of adoption is that most people can't do the break even calculation. But they have been putting that kind of stuff on the packaging now days like how long it takes to start saving money or how much money one saves over the life of the bulb.
In California a kilowatt hour (KWH) cost 25 cents once you go past about $300 KWH. Ao a 60 watt bulb uses about one dollar of electricity more and an LED bulb in in 80 hours. If it is on 4 hours a day then that is 20 days. So it takes 360 days or 1 year to break even on an $18 bulb. Most people just see $18 and think it is too much. They don't realize that they will be getting light for almost free in one year.
I replaced my refrigerator with an ultra efficient version, replaced all my light bulbs with LEDs and replaced my desk top computers with efficient notebook computers and now my electric bill isn't a significant portion of my monthly budget anymore. Previously I had compact fluorescent bulbs but they use about twice as much as LEDs and they have mercury in them which is toxic to the environment. Now I have a box full of CPF bulbs in the garage waiting to be properly disposed. My heat and hot water is gas and I have a tankless hot water heater and in California the furnace doesn't get used that much as the temperature here is pretty warm all year round. We don't have air conditioning because the cool ocean breeze makes it unnecessary. Land in California may be expensive but one's energy foot print can be pretty low if you use your common sense. I have a separate meter for my plug in Prius and it's rate is 12 cents a KWH. But it cost me so much to have the second meter installed I'm not sure I will ever break even unless I get all electric car which I probably will in the future. I don't drive my own cars on trips. I rent so if it breaks down I can walk from it. So the range issue is a non issue for me. Besides, you save money if you rent a car and drive long distances as the fuel cost per mile plus the rental cost is less than actual cost per mile for a car that you own. That is another calculation many never make. If it cost you 35 cents a mile to drive your own car and you travel 1000 miles in 5 days and pay $150 to rent and $30 on gas that is less than the $350 it cost to drive your own car. Why not drive a brand new car when you go on a trip and let your own car stay in the garage? A coworker convinced me of the logic of this. They guy who pays for your trip is the guy who buys the used car from the car rental company.