I tried to find the post but didn't run across it. I think it was written by the developer of the Lexicon 480. I asked a question about convolution verbs really giving everything that the real room gives. As I remember the real room gives literally millions of delays, and the convolution (of that room) gave back several thousand of those, "enough" as he put it. I imagine that MIR's thirst for power is indicative of how many delays it feeds back. I did find the MIR examples to be far superior to Altiverb (which I use).
As you know, Algoritmic would be a different story, as they aren't trying to recreate real spaces. Even the best Lexicon or VSS4 use very little processing power, yet give great (to my ears) albeit non natural sounds.
I haven't heard anything that comes close to a Bricasti (which apparently uses 10-20 times the power of a VSS4) to add fatness and some of that "lush" which is why I mentioned it regarding lush strings. That lush may come in part from the light chorusing, modulation, etc that those algorithems contain. That's great for some "cinematic" sounds. But something I wouldn't want everywhere & all the time. Which is why I will undoubtedly buy MIR one of these days (I just bought a Bricasti). And which is why I like your "dry sample" approach
It would be interesting to hear a comparison between MIR and Bricasti, although that might be like comparing apples to oranges.
I'm waiting for the next big student sale (cough, cough) to get some more libraries, then will come MIR [B]