Hi Troux,
I have used it occasionally so far, not because I don't like the module but because I didn't had enough time to dive deep into it. Compression is still something new to me, so I still have to gain more experience to be able to provide you here with a deep knowledge answer.
On a much higher level and my first impression working with this module was excellent though. The sturdiness and the quality of a Waldorf module is just lovely. The few times I used it so far, I am happy with it, seems to work pretty well. For me it was good enough to get a second unit :-)
Just very recent I came across a Bastl Instruments - Dynamo module, that looks like a compressor module to me too. I don't know it and I don't have it, I just saw it a few days ago, perhaps worth to have a look at?
Here a copy of the Bastl-instruments.com website about this module:
Dynamo is a combination of 3 utility modules: envelope follower, comparator, and voltage-controlled switch. It combines Envelope Follower and comparator to extract the gate from the envelope. On top of that, there is full-wave rectifier output |EF IN| and Compressor CV curve generator.
When the Compressor CV is plugged into the CV input of a VCA with offset and attenuator knobs, you get a Compressor! The threshold knob on Dynamo sets the compressor threshold, Offset on the VCA sets the gain, and the attenuator on the CV input sets the ratio of compression (which can also go negative). This allows you to create a compressor type of effect from anything: VCA, tube module, VCF, or anything that comes to your rack!
Good luck with the search for a compressor and kind regards, Garfield.