Well, the irony for me is that FS2002 runs like a champ on my Win10 desktop and I have no real reason to replace it.
There are folks out there who swear by FS2004 (FS9) and the various versions of FSX, but I'm not one of them. I skipped them when they came out and stuck with FS2002 so I guess I've never had a reason to get spoiled by the newer scenery although I have back-converted a ton of FS9 aircraft.
With the new (MS) flight sim, I'm keeping an open mind but I won't be one of the early adopters. Let's see what the realistic hardware specs really are and I'm also doubting there will be any freeware support.