I received an email from a fellow who installed an Illius on his Teres Certus 450. He had previously been using a Tri-planar arm on this table. He indicated that the Illius was more natural and lively with more information being passed through vs. the Tri-planar arm. He also mentioned that the Illius has a couple of physical design quirks such as no finger lift and some difficulty with initial setting of the counterweight. I can't tell for sure, but from the pictures on the Teres website, it looks like the Illius also lacks a locking rest for the arm. This could make cartridge mounting a bit tricky.