Cielo's Command Cruisers's

No idea...i see ppl just spamming Hvy Cruisers and LRM. I usually use the Robotics Cruisers with teh stick bombs upgrades.

Late game, I normally build Cielos at about a 1:4 ratio to Kodiaks (same goes for Hoshikos). The times I've gone up against friends in controlled battles (same fleet logistics usage, neutral battleground etc.), I've managed to keep my losses at 10-15% of theirs by emphasizing the TEC support cruisers. So, while not as powerful as their Vasari and Advent counterparts, they're a valid option.

I use them religiously with the other support cruisers, but I build pretty balanced fleets until I see a reason to adjust them to counter.

Like most tools, it's knowing when and how to use them that matter more than just tossing them in the mix and expecting huge gains from it.