I love in Perth. I disagree that the culture is not great - this is something the rest of the Australia seems to love saying about Perth. It depends what you're into of course, but we have art galleries, theatres, jazz clubs, comedy clubs, an annual Perth arts festival and Fremantle arts festival. I took up writing when I moved her me as there is a great amateur writing 'scene' (several small clubs that do events etc) whereas there was nothing like that where I lived in the UK.
The mining boom is on the way out. I have travelled to Sydney and Melbourne and did not find them cheaper than Perth. In fact Sydney was more expensive.
Rent has come down massively. We pay $500 per week for a 3 bedroom house (house built 2 years ago and all new fittings) with a big garden and garage in a nice street in the catchment of a great primary school. We are a few mins drive from the freeway so it takes about 10 mins to get into the CBD. It takes about 15 mins to get to the beach.
Life here isn't perfect. Like pp have said, the distance is hard. We have a toddler and a baby on the way and we do feel isolated. It isn't like 'england with sun' - I think Aussies are different to Brits and that difference in culture has made me feel alienated in the past.
There's a lot of money in Perth and I feel that there's a lot of emphasis on material things and how much xyz makes, how much xyz costs (in my experience)
It is crazy hot in Jan/ Feb. We can hit 45 degrees, the kids can't play outside. You need good conditioning!
I find the summer suffocating.
It's a long way from anywhere. You cant just pop in the car for a couple of hours and visit another city.
I don't find the healthcare expensive. Yes you do pay for some doc appointments unless they are bulk billed to Medicare. On the other hand, I can always get an appointment and can book one for whatever day I like - couldn't do that in the UK. We pay ambulance insurance, can't remember how much but it isn't expensive. My dentist does cost me about $150 per visit but the treatment is far better than I got in the UK.
Definitely visit! I moved here without visiting because my DH was offered a job here for 2 years and it all happened v quickly. 6 years later we're still here and have a family. I still can't believe I just got on a plane! If I knew I was moving long term to somewhere I would raise my family I would definitely have visited.
Hope all that helps a bit. Happy to answer any questions you have a out Perth.