Here's what iZotope/Exponential Audio say:
Enjoy lush, character-filled reverbs with R2 by Exponential Audio. With intuitive parameter controls, you can add colourful spatial effects to your music in no time.
- Natural stereo reverb algorithm
- Dynamic tail suppression to lower reverb in louder parts of a mix
- 5 additional early reflection patterns and additional plate reverb algorithm
- Over 1,200 presets
- Pre-delay and reverb delay adjustable by tempo