I've got Mass Drivr's, Royal Blues, Implodes, LTL-mod Smash's, Pentodes, RTAir's, FET Filters, Super Filters, XQP's, and TSX's. Happy to answer any questions about them.
The ones that see the most use during production and mixing are the Comps and the transformer / tube saturation modules - i.e. Mass Drivr, Royal Blue, Implode, Smash, Pentode.
Smash is KILLER for the Stomps / Claps thing that's in my current Americana projects. It's kind of a one trick pony, but what a trick!

The Implodes are very versatile, and really do that 1176 thing well. Combined with Mass Drivr, the saturation and tone shaping options are off the rails. For tracking I'll swap out something for Super Filters or FET filters and have MD or RB followed by a Filter which follows whatever mic pre I'm using for a more full console-like sound during tracking.
I host them mostly in 12 MrFocus modules - 11 in a CAPI rack, and the last one in a heritage rack. I've got 4 11 space 500 racks, so one Heritage 4 space rack picks up the 12th module for all 4 11 space racks, keeping my patch bays organized, filled to the max, and happy.

Although there are only 2 colour slots in Mr Focus, the Focus EQ along with the drive-blend and mix features more than makes up for not having a 3rd slot for my applications. Honestly, I can't imagine using the Colour modules without Mr. Focus and it's extra features. I'm not interested in any of the "standard" style hosts.
I use Pentode's or Implodes in my Chroma's so they have API, Neve and Tube flavors or a Compressor - all on tap with the click of a button / twist of a pot. Super sweet there to have so many options.
For mixing, I essentially use the Mr. Focus / Colour implementations as "analog presets". When I'm mixing I try not to really be swapping modules, and try to leave settings fairly stable during mixing for recall purposes.
Loving having all these colour options available to patch in. My mixing system is hybrid with 96 i/o on my HDX system.