I don't mind the ITF world. To me, it's kind of neat. However, like Dek said, your sims do age so if you want to get them a career while there, it's probably best to turn aging off for a bit if you plan to take them back to the present. Otherwise, they can age and die in the future. I'm not sure what would happen if you had a family at home and the your sim dies though. I always turn aging off if I want my sim to spend any amount of time there. If he/she meets a significant other and wants to get married, they can, but I don't think you will be able to have any children until you return home. About the jobs, your sim would prompted to quit their job in the present world if you want to have them work in the future. As w/all other jobs, your sims cannot have 2 jobs. Your sim could become quite wealthy just by collecting the mysterious key parts and assembling them and then going into the crashed space ship and collecting the items over and over. The "Hard Copy of the Internet" books are worthless to keep b/c there's no use for them, but can be sold for quite a bit.