* Autocompletion is fantastic. This is already a deeply ingrained part of my regular WOLips development workflow (I've only even been using WOLips for about nine months), so it extends easily for me to the WOD editor. Once I have a good grasp of the layout of the data I am modeling in a component, it's much faster than digging through the list of bindings in WOBuilder to figure out what I want to connect.
* The latest, absolutely kick-ass round of refactoring features have made it so much easier to deal with my old, WOBuilder-built components that I might have ordinarily been tempted to open WOBuilder for. In a single click, I can convert all the ugly WOBuilder generated names to something much more meaningful, and the end result is that I don't have to go spelunking in my own code to figure out what's going on. I haven't opened WOBuilder at all since this surfaced, and even before then, it was an infrequent event.
* Since I've been using WOLips, my component code ends up looking MUCH cleaner, simply because I have to look at and edit it all the time. That also makes me come off better to the people who actually like to admire others' HTML. Almost the only thing that is a bit of a headache for me is building tabular data views and whipping up the initial layout of forms. I often mock up the code for these with Dreamweaver and copy/paste, so I wouldn't mind seeing some alternative function in WOLips to accelerate that common task, but that's certainly not something I can't live without, either.
* The WOD editor doesn't exhibit all of the bugs that WOBuilder does.