You know what I like best in the 2005 show? The HZT5. Time and again, the episodes I return to are the ones where they're investigating and so on. I'm a big fan of procedural detective shows, and seeing them examining the scene of Aptom's fight with Sho never gets old for me.
Conversely, the fight itself was a disappointment. I can do without Aptom sexually assaulting Mizuki as in the OVA, especially as he's building up to his eventual face turn and heroic redemption, but the 'camera work' when Sho finally regains the Guyver and when he counters Aptom's blast were perfect in the OVA.