small domes are good for one thing: keeping out light fighters. they have a real hard time getting thru it and will likely draw every match even without actual guns to fight back. not a bad price too, however, BS mop the floor with them. not a bad choice, but you should really go for the large dome. those are really hard to bring down, in fact i can only recall ever one instance i had to make a new one.
i just lost my small dome in the last attack so im pissed at small domes right now, but honestly, its a great way to keep out these early attacks and someones going to need cruisers to get to you effectively.
Yes it help 
