An interesting video review of the Max Carta:
https://www.youtube.com/watch?v=s3ogqUJ7OwU
They seem to experience significant difficulties with the eraser function when in note taking mode. Check out the 5:00 mark and again towards the end of the video at about the 13:23 mark.
I have never experienced much difficulty using the eraser function on my Max. Is it really all that different on the Max Carta or do they have a faulty device? Very strange.