Once again, I'd like to point out that penetrators were over-nerfed when they went from can get from common asteroids and perma-cloaked to must get them from rarer asteroids and decloakable (this happened a long time ago, and I pointed this out then as well). They should of lost one aspect or the other. With both lost, they are a bit too weak for actual "deep strike penetration" uses, certainly too weak to justify a rarer asteroid for.