[PvK]

Ya, even the lowest-level Proportions talisman is a very powerful item, especially built into a large ship, or added to a satellite stack or planetary defenses. +20 on top of any other bonuses is a major advantage. Especially considering the other changes to combat modifiers in Proportions (they are all much lower). And as others have pointed out, the economic benefits are quite potent. All of the shrines have very good effects.

PvK