[tdoranpalmer]

Check the specs and see if they are close to these. If they are it is a high end Compressor or at least a good quality. But as one post stated, "The better they are, the less they appear to be working"

A gain-reduction element, positioned immediately after the input transformer.
Controlled by the sidechain amplifier, which should also contain a two time control circuit – one for fixed and one for variable Attack/Release.

A two time-controller that can either be used separately or combined. This circuit should contain semiconductor OP-amps for the entire control.

A gain-reduction element followed by a tube-based push-pull amplifier with variable gain up to 30 dB.

A dedicated Bus selector (Off, Bus 1, Bus 2) for whenever you want to link several compressors together.

Input and output transformers that have a static-screen between the primary and secondary wirings.

Both Input and Output are balanced as well as fully floating.


Compressor
Input: Ratio: 2:1 to 10:1

Threshold: off to -40 dBu

Attack: 0,5 ms to 300 ms

Release: 0,05 s to 10 s

Additionally the quality of the parts will play a part in the price.

I would also state, that if you can't hear the difference in quality, you probably don't need it.