According to their website, it is $5,500.00 for the CEM120EC ($6,998.00 for the CEM120EC2). AUD: 7,268.91
MESU200 is 4711 Euro. AUD: 7,281.09
Neither would include shipping, but that's a fine "choice" for price comparisons.
Looks like no dealer in Australia for Mesu mounts, while there is for iOptron.
The non encoder version of the CEM120 lists the PE as "< ±3.5 arcsec", so the claim is for the encoders to reduce that to 0.15”, I guess. I am just stating that as I have no idea if it's a valid thing to claim and I can't test it of course.