The new CO of Zeta has it as her command mech/personal ride.
I’ve used the Spartan C in a game or two at this point (yeah new mini!), and it is pretty entertaining: twin Large Pulse and Quad Mediums does ouch. The heat sinks ain’t the best but the only option to change that would be switching out the Streaks for more DHS (not the worst idea but then your a really undergunned Assault Mech). My recommendation is use it like a Clan heavy and not an assault mech. Save the Streaks for big targets at close range or dump the ammo waiting to explode.
As far as availability goes: I’m throwing one in my Blood Spirits Binary. Two Stooping Hawks go with it atm: yes it has an XL engine but I’m using it as a big brother to the smaller mechs.
Finally: don’t forget the Imp in your egg forces. One could argue the Cestus, Champion, Hoplite, Hornet, Lynx, Night Hawk, Ostscout, Pillager, Shogun, UrbanMech, and Stalker to complete your ‘War-Potato’ company (at that point a Trinary).