I live in Carryduff @Newhorizons24. It is definitely becoming much more racially diverse and is a very safe place to live. We chose it because we are from two different religious backgrounds (although it should be irrelevant as we're both atheists!) and we have never experienced any issues with bigotry or sectarianism. I would say it's one of the most integrated areas in NI and has had that reputation for many years.
There is a lot of development happening at the minute and it's a popular area. I would say, however, that the facilities and infrastructure are pretty woeful, given the steep increase in population. A lot of people see it as somewhere you just drive through to get to somewhere else! The schools are generally excellent. There are no secondary/grammar schools in Carryduff itself, but easy access to loads of schools by bus. If your child lives more than 3 miles from their chosen school, they receive free transport, provided it is the closest school of its type (secondary, grammar, Catholic, state, co-ed, integrated etc) It sounds complicated. It IS complicated, but it's all we know😆 My son attends an integrated school and it is very diverse, religiously, racially and with regard to academic ability, having a grammar stream as opposed to simply being a grammar or secondary school.
I agree with pp that the traffic on the Saintfield Road into Belfast is horrendous, because it's the main route for all traffic coming from the surrounding rural towns and villages. Carryduff is a bottleneck during rush hour and there are often long tailbacks and delays.
Weirdly enough, we do have a fantastic water park though, after the local reservoir was put up for sale a few years back. There were worried noises about more development, but it's now a great spot, with waterslides, wakeboarding, camping pods, restaurants etc and a drive in cinema in the colder months.