I should have explained better, but this is not really an upgrade price, more like an additional discount for previous owners of other plugins. The price you see in the user area will also be there for probably all year, while the intro price ends next month.
Yes, this is our most expensive plugin so far. And it was also the hardest to work on. We also had to hire several collaborators for the impulses, and we are going to add more in the future. I'm already in contact with other recording studios to prepare new microphone and speaker impulse responses. As with Springs, this plugin will receive constant updates with new models at no extra cost.