Adam Baratz, of Ars Technica has posted a review of DesktopX 3.1. http://arstechnica.com/reviews/apps/desktopx.ars
While it's perhaps not the most flattering review, it does mention the great potential of DesktopX.
Some of the issues he noted were some of the same things that have kept me from utilizing DX to a greater degree.
Brad has stated that DX, while having much more power and configurability, has been Konfabulator's "Whipping boy" Maybe these are some of the reasons why.