Obviously there were many of these as its said in "The Seige" (ZELENKA: The last of what we assume were dozens of defence satellites destroyed during the Ancients' last stand with the Wraith), so what happened to them? They most likely played a part in protecting planets, if not City Ships themselves. Even if the Wraith destroyed many of them, surely we should have run into another one by now? I think it was a very interesting piece of technology that should be explored again; since we didn't learn much about them.
Basically, what are your thoughts on them? Do you like them? Are they good pieces of Lantean technology to salvage?