Is it viable?

Ok, price seems more achievable now.
What will set it apart from these aside from the reset switch?
the 3.3V & 5V Promini,
Arduino Pro Mini - 5V/16MHz $17
the ardweeny,
http://www.solarbotics.com/products/kardw $10
the RBBB,
http://shop.moderndevice.com/products/rbbb-kit $13
the Boardino
DC Boarduino (Arduino compatible) Kit (w/ATmega328) [v1.0] : ID 72 : $17.50 : Adafruit Industries, Unique & fun DIY electronics and kits $17.50
and others, such as
the no longer procurable iduino clone
http://spiffie.org/kits/iduino/

or this list?
http://www.arduino.cc/playground/Main/SimilarBoards