I think I will become mad with all the demos I'm testing concerning mastering plugins, and with all the current deals, I 'va to decide myself (no joking, I come to have nerve problems so much I test, compare, listen carefully...) I started with the demo of the Waves Linear Multiband comp, and came to the FabFilter Multicomp...It's true that Fab plugin are really very easy to use and it's very nice; IMO, the Fab has a more "synthetic" edge but in a pleasant way... But when I engage the Melda Mspectraldynamics, damn, the sound was very good as it thickens the sound while controlling it, but in a way that seemed to me more natural than the Fab (Sorry for my lack of technical words) . BY CONS, even if the Melda plugs have a big window GUI, I don't grasp their "logic " and for me, it's a pity that they have not so direct access functions like Fab... And concerning Mspectraldynamics, it induces a big latency. I don't know for the other Melda plugins ?
Concerning Eq, I heard excellent things from DMG audio : particularly equilibrium and the "little" Equick... But I didn't test and it seems that they not propose "dynamic" ability.
On a personal feeling, I 'm always in search of how a commercial hit song/music has this famous impact sound, and it would seem that these "dynamic" tools could help (?)