I commented earlier tonight that Spirecraft seem to have hulls made from the finest wet tissue paper. This prompted me to consider their health, in particular of the Spirecraft Siege Tower, which purports to be able to "[repel] a beating." (This is the only Spirecraft I have built right now, so I haven't gone and done a comprehensive examination via the wiki or spreadsheet.)
The MkI Siege Tower has 4M health and 12k armor (I'm playing low caps, but I don't think that makes a difference here). I think it's worth noting that (pure health-wise, per-ship) it is outclassed in health by every MkI combat starship save Raids due to their recent buff. The closest is the Leech and Plasma Seige starships with 10M health and 300 armor. With a cap-health of 8 * 4M = 32M, it is still outclassed by the MkI Bomber Starship (cap-health of 36M, 300 armor) and Zenith Starship (36M, 1k armor).
I do realize that their armor will essentially make their health 20M for many smaller ships (if I understand armor semantics correctly), but larger ships like guardians and starships are likely to outstrip that pretty quickly.
I also realize that their attack is significantly high (40k * 20 = 800k), but that doesn't do much good if larger ships (especially if not in a 1v1 battle) can nuke them down in a hurry.
Finally, I do realize that especially for the lower marks, there are plenty of asteroids to rebuild them, but for a superweapon, they shouldn't feel like they go down as easily as starships. Furthermore, I would like to use those asteroids to build other spire ships (especially considering I can't repair some of them at all) instead of constantly rebuilding the "combat Spirecraft fleet."
Has anybody else had similar thoughts? Am I using them wrong? Does anybody think they're actually overpowered? I created the poll above to