Overall, I like the functionality of the Alignment dialog, but...

I have two monitors side by side with my Xara window full-screen in the left monitor and all my galleries open in the right monitor, by default. There is one thing I hate over and above everything else about the Alignment toolbar. Let's say you launch it and leave it open. Then you launch or select another toolbar like a Bitmap or Layer Gallery which then sits on top of it. The Alignment toolbar button is now greyed out so you can no longer select it. But because the dialog is behind all of your other dialogs you don't know where it is. You have effectively lost it unless you close all other toolbars / galleries until you find the one it is behind. That sucks über bitter lemons in my book.