I got my copy of General de Brigade de luxe edition a few days ago, and have now read it a few times, although not yet played a game.
My first impression is that it is much better than the old 1st edition which I bought many years ago, although never played. Rules I particularly like include:
1.2 - differentiation of infantry frontage in 2 or 3 ranks and base depths kept to minimum.
2.4 - superior & inferior cavalry mounts.
2.7 - limitations on massed columns.
2.13 - historically correct British temporary light battalions.
6 - range of simple orders with unambiguous orders cards.
8.10A - large units taking longer to change formation.
8.16 - detaching cavalry squadrons.
10.18 - infantry holding fire v charging cavalry.
16.2 - cavalry charges by squadron.
I do have the odd query so will post those separately.