The only good thing about XP is the scripting and new graphic mode. The rest is pretty usual, or worse than the others. I hate the face/battle sets, and some of the functions have been removed.
But, it
is pretty cool with the new resolution. You can have charsets of substantially different sizes on the same map, and you can put about a bazillion tiles on the same chipset, not to mention the extra layer.
It might get popular, but I don't really use any of them anyway...