I've found Concrete Limiter to be very nice "Correction Tool" and very musical sounding for mild gain stage purposes for instruments getting lost in the mix. It's ill suited for being used as a sound effects plugin. Only time I would use it on an output buss it to compliment or further subtly tweak certain buss compression settings that can't be properly achieved with the compressor's "make up gain".
And of course it's great for just taming the occasional random peak that pushes the meter into the red. I really like the fact that it's simple because it's made to do a simple job, limit overloading peaks without changing dynamics or coloration caused by changing attack and release times.
Emphasis on mild because, because just like compressors, when used correctly, your not actually supposed to hear or notice them working.
When used incorrectly, as they all too often are as a weapon of choice for those waging the loudness wars, you are completely crunching the dynamic range where the normally lowest sounds, are raised to equal volume level of the normally highest sounds. there's really no way to control noise and distortion.
all brick wall limiters when pushed, have a nasty side effect of raising unwanted noises that would stay under the noise floor level, which would not other wise be heard, such as guitar hum and or RF leakage caused by cheap or faulty cables, thumps, vibrations and rumbles transmitted from the floor or desk from mic stands.
In other words, normally you wouldn't hear these noises, such as guitar cable hum until the guitar stops playing because the notes and chords being played are so much louder than the hum.
But whack it hard with brick wall limiter, the loudest notes played on the guitar are limited to the highest point set on the limiter, which the quietest sounds (hum/RF/distortion) are push up and increased up to the same level.