I was old school a long time, I used W2K when XP was long out, I used XP until last spring.
Then I built my current machine with 7 64pro. Great OS (here in the company we have 2008R2 sinde last year so I was already used to the new GUI).
Plus, due to the 64-bit OS and 8 GB RAM, the *"§$%&# OOM-bug in FSX is finally history.
Can`t compare gaming performance since I changed the hardware at the same time.
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i7 2600k @ 4,5 GHz
Asus GTX570
Asus P8P67
8 GB RAM
SB Audigy Gamer
128 GB Crucial M4 SSD
Samsung F3 1 TB
BeQuiet E8-700 W
Thermalright Archon
Samsung SyncMaster BX2450 LED
W7 64 Pro