Not the new Osprey version (it doesn't cover WW2 while the original does) but I've been playing Force on Force for a while. Really good rules set, covers every situation you're likely to come across in a game in an intuitive and realistic manner.
I've since moved over to Flames Of War for my WW2 fix, but I still use it for modern games and SF ground combat (Tomorrow's War add-on, full Osprey version on the way), so I'll likely pick up the Osprey book at some point since it includes all the changes brought in by TW and pretty much replaces Ambush Alley for asymmetric warfare.
I tend to lean a
little heavier on hardware for my FoF games :P, here's my 20mm Russians:
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