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Forcefield is the basic drone-for-defense unit (similar to Plexo Cell). It gives you 2 for a very low up-front cost, but hurts your economy in the long term.
Many new players are too afraid to sacrifice Drones and thus undervalue Forcefields. If we assume that a Drone is worth 3 gold (it costs 3 gold), then a Forcefield is like 4 for 2defense, which is the same defense value as a Rhino but cheaper. And they are even better than this makes them sound, because by the time you need to turn to either of those units for defense, Drones are not worth 3 gold anymore. Therefore you should turn to Forcefields for defense before Rhinos.
Another way to look at it is this: often skilled players hold back Drones to block with in the late game. If you were going to do this anyway, a Forcefield is like paying just an extra (and no , because this way you get to click the Drone) for an extra point of defense. That's a bargain!
When you have extra and nothing good to do with it, Forcefield becomes even better - to the point of even being better than Wall.
If you think you will need to use Forcefields to help with your defense, be careful about units reducing your base Drone count (Vivid Drone, Trinity Drone), as they might leave you with no Drone to sacrifice.
If you have excess and no good sink for it, Drones instead of Engineers become a strong purchase for preemptive defense, as making yourself need Forcefields gives you a way to spend your efficiently. This is essentially 3 for 2 next turn if the green wasn't useful for anything else.