Former Harefield resident checking in.
It has a nice village feel and has a community that engages with local events and causes in a big way. The high street has a good range of shops and services (dentist, optician, hairdressers etc). The village Co op and costcutter are good for food top ups and are open till late, but you have to travel to Rickmansworth for the big tesco and even further afield for other supermarkets.
The Secondary school in particular is not very good and performed poorly in the latest school inspections (needs improvement), but the infant school did better.
I would say it was generally safe, but there are pockets of concern. One of the local roads is nicknamed unfavourably for drugs and people in the village often point the finger there for local crime. I always felt safe in our flat, but we did once witness a very violent crime outside our doorstep and had to call the police because of it.
Overall I liked it and our flat increased in price by around 130k in just 4 years there, so it was a good investment. I would move back if we found a nice house in one of the safer & quieter streets. My husband hated it and couldn't wait to move, but he can be rather unreasonable and snobby about location.
If you're on facebook, I recommend joining the 'harefied in your heart' group to get a feel for whats going on at the moment.