To sum it all up in one post (LOL!! Look who is going to attempt it

)
The more computer you have to better FS9 will be.
FS9 runs good on even the weaker systems, but some of the features will have to be sacrificed some.
The weather can be amazing but refer to the above.
And after your first install and going through the hassle of the tweaks you can enjoy it very much!
I don't own a laptop, so can't even think of giving any info on to how it will run on one

All in all, now that FS9 has been out for awhile, and the price has dropped a great deal I don't see the reason for not trying it. After all many here have already figured out fixes for 90% of any problems you may experiance. And you obviously made the first correct choice by comming here to ask you questions

Many here can help you get the best out of FS9 and the system you have available to run it on!