Like the FMR RNC, this is another small, affordable, easy to use compressor. Unlike the RNC it is a lot less transparent, and you won't find yourself using it on every track. However, it has a character of its own, and I find works well on drums and bass synths/guitars.
I record a lot of electronic music with "clean" sounding drum samples, and running the whole drum buss, or sometimes individual drum or hi-hat channels through the RNLA really adds some nice colour to the outputs. Or, if you really slam the levels it can dirty things up nicely. Useful for your arsenal.