Im not sure I would say there is QC difference between the Cadex products and the MDT products. There is definitely a "refinement" difference. EM Precision has done lots of builds on both the MDT and Cadex chassis and both are excellent products. They just appeal to different markets.
The ESS hits a price point of $900 and functionally provides everything you need in a chassis without a pile of bells and whistles. It is also about 20% lighter than the Cadex Field Competition which runs about $1,600.
The JAE is pretty cool, but if I remember correctly, also hitting $2k or higher. The MPA is also a really great chassis option, but I think they are landing at about $1500 as well.
We have been very fortunate in our young PRS sport and all the sponsors supporting the events. Plus we have a lot of really excellent Canadian manufacturers to choose from. Chasing the PRS Blog trends is kind of a waste of time. Every year it is something new that seems largely based on which manufacturer gave away the most stuff the season before. Hint Hint, JAE.