I would love to read some reviews of this app. But at $249 I won't even try it out myself, given the multitude of free, superb open source cms's out there. Especially Drupal, MODx and TypoLight graps my attention.
Maybe the developer should consider reducing his price. Who is the taget user? Low-end people use RapidWeaver, and high-end users use one of the many CMS's out there, both open source and commercial.