The alpha compressor plugin license includes two separate versions optimized for specific tasks. This way, you can always choose the user interface that just works best for you.
The mastering version is the exact representation of the original hardware with all its bells and whistles, including Mid/Side operation, the Niveau Filter section, the Soft Clip limiter and the clever Signal Matrix.
The mixing version focuses on the actual compression section, and by doing so it gives you amazing results without having to spend much thought on the process. Actually, you might want to use this on every single track of your DAW.