Thanks for your interest and the friendly words, Jammusique - still it seems as if you're mixing up several things.
1. For convolution, it doesn't make any difference processing-wise if an IR consists of hundreds or millions of discrete reflections. Only the length of the IR counts when it comes to necessary processing power, and the quality of the recording is relevant for its authenticity.
2. Algorithmic reverbs are _of course_ trying to recreate real rooms, too (... ever heard the "Vienna Hall" from a System 6000?), and they _do_ need a lot of processing power - why is it just today that we see the real Lexicon algorithms for native machines? They relied on dedicated DSPs, that's what made it seem so "easy" on the machine. - They don't need a lot of RAM, but that's a different story.
3. Regarding a comparison of Vienna MIR and a Bricasti: This really is like comparing apples with pears, or should I say: Like comparing a pure reverb box with a multi-format mixing console featuring built-in virtual instrument hosting, instrument-conscious spatial processing, project management and a unique GUI approach.
BTW - my favorite MIR-demo right now is[URL=http://vsl.co.at/Player2.aspx?Lang=1&DemoID=5501] this one,[/URL] precisely because of the utter absence of conventional "reverb". :-)
/Dietz - Vienna Symphonic Library