i guess the first concern is your health ! you have to travel here and there EVERYDAY !
I've many colleagues from my ex company who are now relocated to Singapore....
Many have done so for the first few years, and a little after they move into Singapore. The convenience of commuting in Sg is impeccable. However, there are those who decide to 'build their nest' in JB. Am unsure where, but aside from the daily crawl through the entry/exit points, They're very 'Happy' if you know what I mean.. lol.
I'm not familiar with JB, but my friends who live in JB permanently and work in Singapore live very close to the boarder. Guess they can afford that kind of rental la.