Good plugin. I run Reaper 6.03 native Linux, and I have Couture embedded in a couple of drumset track templates. I've been exploring compression and saturation on drum tracks recently, and the ability to add saturation and shape transients in a single plugin is great, especially on cymbals.
I have a couple of drumset templates where I send the cymbals to a separate submix, and send that submix through Couture. The transient and saturation controls give me lots of flexibility while mixing.
I started with the free version, but wanted the saturation, so I bought it. I'm glad I did. I only use the Sin, Bass and Tube saturation settings, (the others are a bit too intense for me) but as I said, they work great on cymbals.
I specifically got it for drum tracks, and it does the job well...