That is the question. I know this appears regularly in the forums but I didn't find much since the major changes recently to the currency and healthcare situation. I'd like to know what people think today - especially anyone who has recently made the change.
My opinion in a nutshell, is that financially speaking it's not that advantageous anymore. Given a usual spouse+2 kids scenario, on an example income of 12000 a month, net income in geneva is around 9400, while in france on today's rules I estimate it would be a a few hundred less, and will get worse as the soc security rises to 12.8%. Also, we can probably assume that exchange rate changes will probably not be favorable. Of course you can easily save about 1000 a rent for a decent family home. There are downsides of course (commute, bureaucracy, the constantly changing rules, etc) but from a pure financial perspective it seems like a pretty modest savings that can easily be wiped out with even a modest currency fluctuation.
But the best argument to being a frontalier seems to be that buying a place in france is still possible, while in geneva it's impossible at the salary I'm talking about above. That's the only reason I'm considering it.
If anyone as different views on this than me I'd love to hear their thoughts (and rationalizations).