Its quite amazing how different releases have interpretted this infamous track. The two most extreme versions I can think of are the "2009 F1RL trackpack" and this "MMG 2007" version.
Using the Endurance Series Intersport P1, I can comfortably do 2min2secs laps around the F1RL variant, while I am over the moon if I do a 2min10secs lap around MMG's masterpiece (using the same car setup).
The time difference is all in the fine detail of how the track is portrayed. Contrasts that come to mind include:-
The tightness of the chicane at the end of the Kemmel straight
The tighness and off camber Rivage hairpin
The elevation and camber heading towards Pouhon and then into Fagnes
And of course the 1.08 grip factor in the F1RL!
Coming bak to MMG Spa 2007, I'm shocked how little use it appears to get in any public servers. My theory is down to the way it is shown in the Rfactor server browser, "round 14 Belgium" (or something close to that). The first thing that springs to mind is that the track is part of one of those myriad of trackpacks found round the web, when in fact it is a standalone release!