It's been some time now since I last reviewed Xmplify, and I guess it's time for an update.
I've been using the tool for the last few years now for almost every XML editing task on the Mac, and I keep being surprised by its great versatility, quality, feature-richness and stability. Of all the XML editors I came across this is definitely the one I like using most.
Another thing, experienced again just today, is the great responsiveness of the author. I made a feature suggestion that turned out to be for a feature that was already there, and I got a friendly reply explaining the feature within minutes (where, to be honest, an RTFM would also have been in order :-)).
There are lots of tools that are much more expensive and don't have even nearly that quality of support. So a 100% thumbs-up again for Damien and Xmlplify!