Started testing it out, creating a Lvl 11 Monk, was going through the system.
Personal preference is to do Abilities first, then choose class, thankfully you can skip and return fairly easily, but I liked the Over-head menu navigation more.  Anyways, picked choices down to abilities, as mentioned above, seemed to grey out as it talked back to the servers after every choice I made... slowing me down.  When I got to my abilities, and was entering my charisma it decides to crash.  Try to go back in, crash again.  Discard, try from scratch... no dice... must be a fair amount of people trying it out for this to happen.( at least this is what I'm telling myself so far...)  First day, it's going to be a rough stress test.  More errors as I attempt an essential ... crash.. sigh, I'll try again later tonight.  
Oh, and from a coder viewpoint, one shouldn't probably use names for things like  
"at WotC.XAMLUtilities.PropertyUpdatePropertyData.GetPropertyValue[TValueType](IDataSource dataSource, TValueType& value) in e:\DDiApps\trunk\CharBuilderEssentials\DDiApps\CharBuilderEssentials\trunk\XAMLUtilities\NotificationProperties\PropertyUpdatePropertyData.cs:line 278
   at stupid(Object )
   at WotC.XAMLUtilities.LazyAttribute.CreateValue(Object owner)"
There could very well be a context for these name choices I don't see from the error messages, but it seems an odd choice to me.