Downloaded it, installed it, ran it for a few restarts.
It's neat and has tremendous potential, but I removed it (app, widgets, .plists) because I couldn't stand the registration nag which won't leave the screen.
What I wondered most about was:
Is it worth nearly $45?, and
What happens when the widget builders start asking for a fee?
On the plus side, it does have great potential for value. If the widgets are as easy to make as they say, then I can see great value for non-US users creating some localized widgets. For that reason alone it is a bit of a revolution in SW.
On the negative side, there is only so much room on the desktop and I'm not the kind of user who will tolerate icons all over the place.
For me, it's not a fifty buck app. I will check it out again in 6 months or so, and re-evaluate.