I just watched one ship take on one of my planets that had this sheild. The ship won the battle on turn 8. It was a LC. Now I know for a fact that NON of my LC's could take on a Planetairy sheild and beat it in 8 combat turns. I am really disappointed.
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"We've made too many compromises already, too many retreats! They invade our space and we fall back -- they assimilate entire worlds and we fall back! Not again! The line must be drawn here -- this far, no further! And I will make them pay for what they've done!" -- Patric Stewart as Captain Picard
UCP/TCO Ship Yards