You will notice a big spread of course in housing and automobile costs. What I have experienced is that apart from the enormous rents the prices are comparable to, or slightly lower, than the US and certainly less than Europe. Mobile phones and gas are a steal in Qatar. The grocery store doesn't give me sticker shock and my gym is a bargain. I don't have children, so tuition isn't an issue but that should be covered by the employer as should housing and transportation. Oh and health care is a bargain but if you're from Canada or the UK that's not been a problem for you.
Mandi