We moved down to the Tamar Valley 20 years ago. I love Cornwall, and had holidayed here all my life, but living here is not the same. I wouldn't say I regret it, but if I had my time over again I'm not sure I would do it again.
My DH is from here, and when he was offered a good job down here we couldn't wait to move down here. We bought a beautiful old farm house and got a kitten and had a beautiful DS. Within 18 months the company my DH worked for had closed down and he has had to work away during the week ever since, coming home only at weekends.
I was spoiled for cultural events having lived in London, but I do really miss sheer range and scope of exhibitions, theatre and cinema I used to enjoy. There are some good arts events staged down here, but they are pretty slim pickings, and are not always on the doorstep.
If you live somewhere pretty and by the sea, you will get overrun in the summer. There are plenty of ugly parts of Cornwall, and there is an unbelievable amount of house building going on down here at the moment too - I think they are building 60,000 new homes during the next 15 years?There are, of course, unspoiled and beautiful areas, but they can be very rural and isolated. I certainly cannot get to any shops or other facilities without a car. When we had those two bad winters a few years back we were snowed in for days.
So many older people retire down here, and the pressure on the health service is huge. I live in dread of any of us getting ill or injured and having to go to the big local hospital
I find that going on holiday is much more expensive. The local airports offer flights to quite a limited number of destinations, and the bargain last minute deals always depart from Heathrow, Gatwick etc, which means a four hour drive before you even see a plane. There is the ferry from Plymouth, but it costs a fortune.
Finally there is DS. He is 17 now, he is away at boarding school, where he is quite happy. If you are an only child, living in an isolated rural hamlet can be pretty lonely. I really see no future for him in Cornwall unless there is quite a dramatic shift in the jobs market (and if there is, it won't really be Cornwall any more). I am sure that in time I will definitely want to move away to be nearer to DS and his family (warning there for future DIL!) rather than stay down here for ever, and that will be sad, but I don't think I will miss it.
It is a lovely place to bring up young children, but don't get too dewy eyed about how wonderful it is, there are downsides too.