The arc is alright, but sadly the best part are actually the post volume drawings of robot innards that are incredibly complex, interesting to look at, and filled with information. It's a shame a few more impact panels didn't show off the authors arc, but I'm sure with a serialization like this there was time pressure associated with it, and these drawings were from a pre-serial phase.
This manga is reliably consistent with Go Nagai's style, which is it's greatest strength but also it's greatest flaw. While the audience is certainly not looking for much more than a typical Go Nagai work, I always bemoan the opportunity to tell a wider, more interesting narrative in a work like this rather than simply playing with Nagai's database.
