Quick note: As I'm still in the process of organizing the disk/file structure of this Mac Pro, I moved a project containing some IRs loaded through NadIR. The IR slots turned up to be empty - for obvious reasons perhaps, and I certainly won't complain ad it's free, but if it was a professional product, there should be an "IR file not found, search?" option as on, say, software samplers. As is, you can basically never move a project, because even if you reopen it from the same place, while the IR will be loaded, the path-memory is gonna be lost, so there's no way to manually reload things, either (NadIR it doesn't display the loaded filenames).
Will be having a look whether others are doing it the same, otherwise it's back to Space Designer.
2010 MP 2x2.66GHz, 16GB, 500GB SSD System/Logic drive, Zoom UAC-2, LPX 4.2, OSX 13.6.