Native Instruments Solid Bus Comp by Hammer v2
The Solid Bus Compressor comes with NI's Komplete bundle or can be purchased separately from NIs website.
And as far as bus compressors go...it's gorgeous! Adding a big fat warm seemless glue to anything it touches. Yay.
There's not really a lot to say about it...It works really well and sounds fantastic! Totally worth adding to your mix...IF you have NI's Komplete bundle.
You see as a standalone plugin, Cytomic's "The Glue" sounds just as good, has a few extra features and is a third cheaper. So you may as well get that instead.
So in summary it comes down to this...
Have (or buying) Komplete...then forget about buying another bus compressor and use the SBC. You'll love it.
If you just want a bus compressor then you may as well buy "the Glue" as it is simply better value.