First of all, remeraber the Nia torture scene and how she still had her ninja outfit on? Yeah, in this she....doesn't. Gainax you pervs. (Also, Yoko and Nia fight naked for some reason in their Gunman. You know, in that spiritual way...oh forget it, you know it's just fanservice...)
Second of all, the Chou TTGL moment is even more epic than I thought because all of the personalized Gunman have their own fight scenes!
Third of all, get ready for this. SIMON AND THE ANT-SPIRAL LEADER HAVE A FIST FIGHT IN THE VEIN OF (as it's said) HOKUTO NO ****** KEN! Blood and manly punches everywhere and Simon's hand turns into a dang Giga Drill Breaker!
As for the epilogue, it's a bit different because Simon's now wearing Nia's ring as a necklace and now helps out a small villiage by drilling for water.