While this form didn’t get as much play as Tengen Toppa Gurren Lagann or the super form, the fact that Simon was pushed into it by the death of Kittan made it my absolute favorite form in this anime.
Motherfucker had everything on the line and when the chips were down, he busted out what was, at the time, the largest and most powerful transformation available. Sure, Simon transcended this and went on to win, but this was the penultimate form that even Genome, the guy who made it, didn’t expect to even show up. This was the goddam turning point in the climax, and we even got a badass speech to go with the summoning of it.
Also, the title of this mech totally beats out any other one that shows up in this anime. Transcendent Super Spiral Dreadnought? Good God.