I'm not familiar with the Magus but I do have an Octopus skimmer.
I've only had it a few weeks now but I do like it very well. It was easy to setup and began producing slimmate very quickly.
Also, Coralvue's warranty and customer service impressed me. Mine was a gift and the chamber had a small crack when it arrived, slow leak. I contacted the company and they asked for photos. After I sent the photos for conformation they sent out a replacement part and had UPS pick up the damaged part, no charge to me. It surprised me that there was no hassling for the issue. I was definitely happy.
Oh, mines the Reef Octopus BH-2000.