Hi Paul, this was from an older version of Bamboo Labs. The EA has since gone through major algorithm updates and the current build is significantly improved from what was available at that time.

At the moment it is free while I work on building momentum around the new algorithm, but that will not last long and it will be returning to paid in the near future. Your purchase was not in vain. Please download the latest version from the Market and run a fresh test on the updated build.