you need to have all debts cleared before you leave for good so if you leave early then this need to be paid off. The expat lifestyle can be really good and you will make many new friends out here.
Its a massive change of culture, they are trying to embrace some western ideas but Qatar next to Saudi is more traditional Islamic and you are advised to be careful and respectful of the religion.

I like the place despite the problems I'm having with my company and the visa rules here. I like the heat. It is one huge building site though, roads, buildings all being done, the skyline is full of cranes