Why is having a lot of BUs running such a big deal? Won't that be the same as doing HTTP GETs?

It's important -- and it's a big deal -- if you are trying to test a web application in which the interaction between the browser and the server is more complex than "just navigation".

The obvious example of this is an AJAX application.

For an AJAX application you need full browser realism and possibly special synchronization logic in order to assure realistic user data. You can't get this with HTTP GETs because HTTP protocol exchanges are "memoryless" whereas browser-based interactions do have memory.

(There is a recent eValid BLOG posting about this topic. This is a big issue!)

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