Why do we keep a lid on such threads? Mostly to avoid the grief of the unending promotional spamming: "What do you think about so-and-so's domain appraisal tool/service"?
That said, we're not going to leave you hanging.
Give me a few days to structure a "let's kick the dust up and talk about appraisal services" (again) thread - with some groundrules.
Folks, pending that thread getting started by me, I invite you to go out and collect some data. We may even talk specifics, as in specific domains, in order to get a sense of how well any of these various domain appraisal services are working right now.