Hiya Revo,
there is some controversial discussion out there about the use of a microtrash products to be used in flight training.
Here is one take:
Students using the Microsoft FS ( or X) display a unusual high understanding, especially when finishing the flightschool that comes with it. So some exposure from this program is very beneficial.
The downside seems to be fixation on the instrument panel and a certain feeling of being overwhelmed during actual flight if turbulence is encountered.
Becoming a private pilot is a lot of information seeking entry into the brain at once. The more doors you can open, the better. If you learn for advanced ratings you are falling back on some sort of knowledge and skills and generally understand the simulators limitations better. I have heard many people say that they fly for virtual airlines (as real as it gets sometimes) and feel nothing can take them down. (I sarted giving lessons online about 4 years ago with the multiplayer thing, and let me assure you, yes, some hit the ground head first... LOL)
I mentor about 6 people per year on their dream to become a pilot and usually recommend minor use of the MS FS until some good habits have been established. Thereafter the navigational & handling systems are a good support for learning the ropes. VOR/DME, NDB, GPS & even dead reckoning can safely be practiced before doing the real thing, which saves time and money. What I sometimes do before taking a Simulatorcheck or Instrumentflight is to practice the approaches I intend on using. This sharpens your mind up a bit and if a good instructor is with you you can be well prepped for whatever there comes.
So, generally, yes a simulator is a good tool, but no, if done wrong it can cost you more money to "untrain and unlearn" negative habits.
Flying is about habits and the ability to make responsible decisions in a short to medium timeframe, there is no room for ADD or ADHD and at times it can take the mental capacity of experienced pilots down to 10%. In the German Luftwaffe we had the opportunity to be hooked up to a machine while flying in dangerous situations and it was amazing how much strain a dangerous approach to land, or several missed approaches puts on your box. Nonetheless I strongly believe that everything can be trained for, except for a faulty A&P...
Sorry jetmech LOL

I had to pay this one back!