I think I might have a really long time ago. If I remember correctly, it's more slightly more action oriented and Casshern/Casshan didn't act quite as emo. But like I said it was ages ago. I was probably somewhere around 13-14 when I saw it.
Edit: Since it was translated in 1995 I would have been 14 when I saw it. Also there are several plot points which differ between Casshan and Casshern Sins so they aren't really a true Prequel/Sequel series. You could watch one without needing to watch both.
Edited by sevi (02/26/13 06:17 PM)
All I need in anime are these things- Samurai, Swords, Sports, Mecha, and Shounen Ai <3