We have one in our STL playout chain, mainly acting as limiter with very moderate compression level.
For internet radio use just make sure the preemphasis (buttons at the back side of the unit) are switched off.
In a nutshell, in FM broadcasting certain frequencies are boosted before transmission (inside the FM transmitter, before multiplexing), and reduced again in the receiver.
The limiter shall keep the output signal within the legal limits for the multiplex signal, so it must be told that this frequency boosting will happen further down the chain, and account for its effect on the MPX power.
When you use the unit for web radio etc., just turn preemphasis off. You only need it for FM.