Very much so, I have tried to paste in some more complex sequence diagrams I have written and they almost work. Except no aliases and no on the fly creation/destruction of participants. (or maybe the syntax is different)
I would prefer if this actually followed the plantuml syntax exactly, that way one could ditch the official java application which is quite bad (and graphs are quite ugly)
Totally agree. Plant handles many complexities quite nicely, despite the poor tools available to render the visualization.