Sorry if I'm replying too late but I've just joined and found your question. I'm with WebAii for almost an year now and am absolutely excited about it. We use it both for ASP.NET and Silverlight test automation and it completely fulfills our needs for test automation over some of the complex Web components out there. WebAii 2.0 is getting way too cool with its new great features including Safari and even Chrome (guess a bit later) support as well as the Silverlight framework I currently work with.
Is this an ASP.NET or Silverlight project you look on test automation for? What are the features you look for?