Interesting but not very well thought though. I have installed it once, then removed it.
Many new things to do. New sources of money. Ability to really work from home. New playable type of characters (robots). New items. All those things definitely make the game more fun and give you somewhat improved SIMming experience. :) Unfortunately, review does not end here.
Bad things about expansion.
New ways to die. I mean, you add a elevator to the game, a way to move level to level that will be used constantly. Yet they give it a chance to kill my character? A character who can be immortal by using aspiration rewards... All things considering, i do not know a single person who died in elevator crash in real life. Why not to make elevator break down and having to be fixed by calling a tech with you being stuck there for duration instead of killing sim and it would be ok.
Here is another way to die. Must be a theme for this expansion. Robots are destructive. They go crazy, start melting your house and you sims.... Might be an OK for large family house with full family living in there where if 1 left alive he can revive the rest, but still unacceptable for people who do not want to control more then 1 sim in the game.
For people who wants to play a single character (meaning that nobody can revive you if you happen to die) thats is unacceptable. Yet this is not the main reason why i removed the expansion because those things can be ignored simply by avoiding building elevators or robots.
Main reason why i removed it was that it completely destroyed balance of existing professions. Why would i work towards building career of my character if i can make 15-20 thousand credits in a day of trading in a store right from my house without much effort? In fact, after running a store for few weeks, you can pretty much let your employees run it completely without ANY input and still make 10k+ per day. That expansion feels like a money cheat taking away any reason to make friends, advance skills, etc... I have tried to take up building toys and other things but there seems to be so little benefit to that comparing to simply buy items and sell them at higher prices (paintings for example). Compare that to 10-15k you can make in a week in existing careers while having to maintain all the requirements for promotion... Major flaw right here.
I understand that this can be a case of me being spoiled with excellent expansions they came out with like University, Nightlife, Seasons...etc that really added to the existing game without disrupting things in major way. But in any case i can not rate this expansion high.