I have a little experience with WB. I liked the idea of the program, but it was always a bit quirky and not very user friendly, in my opinion. If these blocks intrigue you, you should check out Super Note Card:

http://www.mindola.com/supernotecard/

SNC has not been updated in a few years, so it may be moribund, but it is cheaper, and I think it is better designed -- although it is a Java application, which may not appeal to everyone.

Of course, Scrivener can do a lot of what either program can do and a lot more.

Steve Z.