Supply Platforms can be upgraded to provide one of:
Extra range to nearby units, detection, and long vision
+50% supply capacity and bonus health; not worthwhile since a Supply Platform also costs 75 Hexite
A mediocre turret
Supply Platform upgrades cost 75 Hexite
Production buildings can heal one nearby unit at a time
Harvesters have a decent Healing Wave ability that restores 150 health to biological units
Guides & Information
KD's Comprehensive Co-op Aster Guide
KD's Comprehensive Co-op Aster Guide
Additional Notes