I watched Kaikatsu Zorro all through my childhood. It was called Legend of Zorro where I live.
...and all that I have to say, is that it RULES. Seriously, it remains one of the best anime I've ever seen, for both nostalgia factor and classic goodness. It's unbelievably western, seeming a bit like a classic comic book at times, and that "transformation" sequence is only shown when he's changing outfits, and it's not that flashy to begin with. Zorro's alter-ego, Diego, is the Vash the Stampede before there was a Vash the Stampede, and plays the bumbling fool so damn well that the whole thing is amazing.
I own the whole thing on DVD. It rocks so damn much. ;_;
[youtube]http://www.youtube.com/watch?v=4yc6RPXiftM&feature=related[/youtube]
PROPER opening, if you please.