Check the mod priority guide:
https://docs.google.com/spreadsheets/d/1ty239kyJbBs1sLhTo1JvSWuN0mIJsK1nwVdI6OLLtXo/view?rm=minimalM950A (Calico) MOD brings some powerful and interesting upgrades to the mix. She’s already an amazing HG and only goes up from here.
Even at just MOD1, Calico already gains an excellent boost from her enhanced tile formation and improved Skill 1 multiplier. Not only does her tiles’ buff amount improve, she even gets a new tile positioned straight behind her, giving her more tile flexibility.
Skill 2 from M950A’s second Neural Upgrade stage is where things get really interesting though.
SOUL LIVE! grants one of two different effects depending on the type of node that her echelon enters combat in.
If it’s an allied node, a
deceleration zone in front of the echelon will be made that reduces enemy Movement Speed and evasion.
If it’s not an allied node, she’ll give everyone a
small RoF boost for a short time and also
massively buff non-HG doll Movement Speeds up to exactly the same speed that HGs enjoy (excluding any Movespeed-modifying equipment/skills).
On allied nodes, the whole echelon will enjoy the safety that comes from the reduced enemy Movement Speed, buying them more time before they enter attack range - especially useful due to the long initial cooldowns and low initial DPS of RFHG echelons. On non-allied nodes, the extra ally Movement Speed allows for some otherwise impossible micromanagement potential when such a thing is needed - like dodging enemy AoE attacks with otherwise slow RFs.
Overall, this is an extremely impressive MOD for an already strong HG.
It’s absolutely worth getting her up to MOD2 for the new Skill. Even then, if you’re really short on fragments or cores, MOD1 is still a strong enough option to be worth considering if you don’t need the FCCs for anyone else.