I have WOV, WOI, WOE, and the original SF. I went ahead and purchased SF2: Vietnam. I am totally stoked at the improved hi res pits, terrain, and effects - it's like a whole new sim for me! Plus, I am a huge F-4 fan which swayed my decision.
I picked up SF2 europe.I like it nice brake from Locked on and the other sim a have. Only played one mission and had alot of fun without have to study a manaul.
Based on the excellent review by SimHQ; I when ahead with the purchase of SF2 WOI....Just beautiful!!!
Consequencially, that let to the un-installment and purchse of other SF2 versions (SF2, SF2 WOV) the re-installemtn of SF2WOI with patches....and for the last 4 day's it's been nothing but fun!
No mods and I run in the 50fps (full on) on a AMD 955EE with ATI 4870 (2048) and 6 gigs of 1066 ram with vista 64.