[Paladin]

The math seems to balance out, but I Assure you I've seen the shields regenerate completely...
After about 20 turns, I had this little colony in another empire's system, so I wanted to build a Killer defense station there. I took a basic space station, put the requirements, two Shield gen IV, 5 Crist. Armor II, 3 Large Shard Cannons IV (and a capMsl I think), all the latest I had this early in game.
Since my Phong AI "friend" also had crystaline tech, this was going to be rough... Still, they would need to make at least 50 pts of damage to begin to dent the shields... quite impossible this early in game, even with rocket packs...

Suffice to say, each and every attack on my station resulted in total victory, except for the fact that onc the ennemy came from behind and obliterated the colony's population ;-( but left the (endless supplied) Defense Station to hold the planet advitam aeternam...

I don't even bother to watch the cruisers crush on this baby like water on a reef...

Suffice to say, Cristalline armor really is too powerfull... As I said before, maybe if it wern't cumulative, like the combat sensors...