Come over, do the interview. You have read the comments here. See what you think are valid or not. Make contact with some who are here, AOA would give you some contacts. Do you OWN research into the cost of living. You have heard others comments so will know what areas in particular to look at. Price up groceries, visit the real estate agents, view some flats etc.
Interestingly enough some years back CX tried recruiting the likes of Pakistanis as the CX pay translated to US$ was streets ahead of that in Pakistan. Many looked and ALL chose not to come based on the cost of living and life style which was much better in their home country than in HKG.