i disagree- many people dont notice that shields and armor are 2 COMPLETELY different things. thats why u have so many different kinds of weopons. take the emalgha cannon- their strength is taking out armor- not shields, so if you have shield enhancements, you wont be taken down as much with armor weopons.
my point is that as much as shield enhancements seem inefficient towards their price- having very few shields will hurt you a lot no matter how much armor u have if your going against heavy armor-fighting weopons, because u dont have that extra buffer.
and its vice-versa if you're a shield-heavy guy: those phase beams wil really eat away at those shields- and once they are gone, all u got is ure armor: be prepared.
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NOTE: Dont Send your shuttle w/ all of your Saalian Brandy alone into space; u'll be sober for weeks