Wow, so much has changed since we built our house in 2010.
If you read the thread from the beginning, you'll read the fiasco that happened with Westminster Homes & how they went out of business just as the frame of our house went up. It took 2 years to finally complete the house...anyway, thank god thats behind us now.
Re downlights, we have 68 of them in our house, I can tell you that we're so glad we didn't go with cool white, we went with warm white. Also at the time we got the electrician to wire them up individually, not in series which simply means should you want to change a single light it can easily be done.
My son built a house a year ago, decided on cool white ( as per his electrician ) only to replace the whole lot 6 months later as he felt it made the house look too clinical. If I were to build another house, I would definitely put down lights again, but take note of what's called " shading" & perhaps add ceiling lights ( as a feature perhaps ) as well.
Great to see that you had a good finish after the earlier challenges !
With regards to the Downlights there is a switch at the back which can be just flicked to change the colour. Instead of replacing the lights just flick the switch. Majority of the newer downlights have them not sure if yours had it.