How balanced is the mod?

It feels balanced enough to me honestly. The building works like the Foundry/EM Plant/Bio-chamber, in that it's a new building from Fulgora that feels like an assembling machine 3.5/4 with a built in 50% productivity bonus and better base stats. But can only build a small selection of recipes in return.

I think the balance is in a good place as a standalone mod.

It's gated deeper in the tech tree relative to most space age unique productivity buildings. You need to export Electromagnetic science to Nauvis, or automate the other sciences and build labs on Fulgora.

In return, you get a productivity boost to bots, making yellow and blue science cheaper in the long run and facilitating easier quality grinding for a small selection of personal equipment and other recipes. The 5x5 is a fun building to design builds around as well, IMO.