We believe that the RNP is a good addition to any studio looking for an exceptionally clear, transparent sounding mic pre-amp, i.e. if you want to hear the artist's voice, drum, cymbal, bass, etc., not the pre-amp.
The Really Nice Levelling Amplifier (RNLA) is a compressor, of sorts, with a character that works well with vocals, bass guitar, acoustic guitars and two-mix sources.
If you have only 1 RNC or RNP and want to fill the other side of the front panel with knobs & goodies (to look like an installed RNC), this will do it.