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I replaced all my downlights with these and don't regret it at all. No more arguments over cool white/warm white and which it better for cooking or eating. Just switch when you need. Individual lights can be controlled effectively and the ability to switch on lights for my dog when I'm out in the evening is very cool. They're not the brightest downlight but they're definitely brighter than the 5w MR16 bulbs I had before.
Installation was a breeze as well as all my old lights had individual power sockets in the roof so I didn't even need to hire an electrician.