A simulator trains muscle memory, and is invaluable. Consider all the emergencies you can train for in a good simulator that you could never do in the real thing. Consider the running expenses of a simulator compared to the real thing. Consider the number of times you can crash a simulator compared to the real thing. (!)
When was the last time you were able to fail multiple instruments in the real aircraft and, for instance, be in full IMC and watch the AI topple slowly, without warning, and learn to recognise the symptoms and be trained on how to fly the aircraft in that situation, and if it all goes pear-shaped, stop, get out, have a cup of coffee, then get back in and do it again?
Certainly, it's not the real thing, and even if it's the same type and same cockpit configuration as your normal office, it's effectively a different aircraft and shouldn't be confused.
Anyway .... I'm a big fan.
