I'm all for two different versions on the app store. Also, Mackie's latest version is so good, that a fee for the upgrade would be OK for me. (Think it would have to be over $20 to bother me, though I'd probably pay $50 and grumble.) So for all those people avoiding upgrading because it isn't perfect, if it were perfect, how much would you be willing to spend. (a 30 day free trial would be appropriate to see if you wanted to live with it.)