The Powercore plugins play another big role in my studio, both mixing, mastering and also synthesis.
The Virus Powercore plugin is not as fat as the B "mainly because of the digital vs analog output scenario" but even so, its feeling sharper which for me is a big win over the TI series. I can't live without its input to my tracks.
Other than that, the MD3 multiband plugin is a valuabe asset when i do mastering. It's direct, easy to use, and the compression feels so right compared to any other multiband compression i've used for mastering.
For vocals, the emulation of the Tube Tech CL 1B has always been my favourite.