Only a small group of ambassadors formed the actual test group Ian. That allowed for more concise and constructive feedback.
There have been the usual minor bugs to be sorted out, but also some changes to the structure of the program that needed to be addressed. All of these modifications are to give shop owners a much improved product. Better the program get 'tweaked' before its release, rather than have to endure repeated updates in the short term.
The development team were aware of the issues with the one payment address. The pro version is being aimed at a different target audience, so expect a whole new range of features.