I live in Chalfont St Giles. I love it.
Like many others here, DH and I moved to CSG from London before DC1 started school. Like many others here, we are not originally from London. I'm not even from England.
We have lots of mates here who have lived all over the world or are from other countries along with groups of locals whose families have been here forever. I like that my friend group and my DC's friend groups are not too rich white british conservative (a concern for me before we moved).
DH and I both commute to London, both from Chalfont & Latimer but that because we live that end of the village and the tube is handier for our end destination. Plenty of people commute via Gerrards Cross.
The village school is lovely. The grammars and the community colleges are excellent to the extent I am not particularly bothered about whether my DC pass the 11+ or not, they'll go to a good school either way.
The housing is expensive. There isn't much of it on the market. It's a village not a big town and people tend to stay for years. Finding the right house here can be difficult. Lots of people rent first.
Nowhere to avoid really. Accessibility in snow can be an issue, so think carefully before living down a farm track at the bottom of a hill.