I've got to say that I've read through this whole thread and I'm pretty disappointed by some attitudes to be honest.
I was a Beta tester and I had some issues with the queue system in my mind. I've been using it on stage as a solo and a duo/trio for three months+ now and like some others in the thread have many tracks loaded (over 1100 at present) and some quite large audiences. I extensively use the midi functions to control reverbs, effects, lights and even a powerpoint background display on a PC using Bome Midi Translator. I too use an airturn. finally my main iPad is networked to the other members of the duo/trio iPads. So i'm pushing the system very hard. I pick next songs on the fly in mid song and it has to be slick.
ST2 worked superbly and there is an argument that if you are so unhappy with ST3 then just use ST2.
BUT
St3 will remain stable as iOS (and iPadOS) advance and will allow you to use an iPhone for ST3 (great for the networked lyrics).
Peter has done an amazing feat with this software and I really can't see him getting rich on the income compared to all the hours he's put into getting it to this stage. The Beta testers, including myself gave him a hard time and posed many challenges.
Just put some time into using the ST3 version and I know the advantages will outweigh the disadvantages. I'm still throwing challenges and I'm sure that if it had been me in Peters shoes I would have told me to get lost, but he has not.
So lets cool the rhetoric and give the guy and his software a chance.