I'm bumping this for you. We were there earlier this year but only for a week in total although we did catch up with friends who had lived there for 2 years (back 2 weeks ago). So I'm definitely not an authority but.....
It seemed to have a very diverse cultural mix. The choice for eating out was great. It was very fast, densely populated, humid/hot and the traffic unbelievable. It is neither Singapore nor Thailand but a mixture of both, I guess reflected by it's location i.e. designer shops, very flash hotels next to falling down buildings and the stench of raw sewage. The friends we visited had a fantastic villa probably 15 mins as the crow flies from the city centre but 1.5 hours in the traffic! Lovely pool, air con and huge although they had to keep the shutters shut at all times to stop the monkeys coming in and stealing things (we couldn't leave our shoes outside) which my boys thought was great and ds2 spent hours looking out the window for monkeys doing somersaults in the pool. We stayed in a hotel for a few nights and couldn't drink alcohol in the restaurant, westerners wanting alcohol had to sit behind a curtain in a windowless room off the dining area and children were not allowed. A reflection I guess that it is a muslim country. We did venture to the Westin for dinner and paid an absolute arm and leg for a bottle of wine. If KL is anything like Hong Kong I would find out where the ex-pat clubs are and join as alcohol will probably be cheaper (a guess?) Our friend (male) worked and found it a hard country to work in due to the vastly different culture, work ethic and corruption, his wife was refused a work visa and found being an ex-pat wife quite hard. They had been working in Dubai for a few years prior so were used to working in a different culture. They raved about the schooling - International School. We had a horrible moment when a man tried to walk off with ds2 into a lift and witnessed a bag snatch (common as there are signs in the streets warning of it along with notices in the hotels). Our friends car didn't have seat belts (common I'm told), ds 2 traveled on my lap (I was petrified and didn't want to get in the car but they said it was what everybody did), the roads full of pot holes from the airport and the bus ride very hairy.
If I were given the chance to live there I would probably take it for the experience, short but not long term in mind. I think it would make a great base to visit Borneo, Singapore, Thailand and the fantastic beaches the area offers. Am hoping somebody who has lived there can come on and give you a better view rather than impressions after a week. Failing that our friends who lived there are coming for dinner tomorrow night I am sure I can pick their brains.