I love my lightbulbs and they work well. No degradation in illumination. It is pretty blinding, but it's definitely what we need.
The advertisement says not dimmable. You have to unscrew them and put them into the included hook for them to turn on. Bulbs are in lamps but do not light up when power is off.
They are pricey, but nowadays especially, quality comes at a premium. Also, they dim nicely without flicker. Durability seem good.