I love my rM2 it’s amazing for reading manuals, books, any PDF, drawing quick sketches for 3d prints im working on, note taking, custom template note taking, it lasts me a month without needing to charge it, and on top of all that it runs Linux so I can load whatever custom code I want on it!
I don’t know where you were getting this $10,000 figure or your claim that it “can’t save anything you write down” but the rM Pro is only $579 which is still cheaper than a lot of tablets on the market and it can infact save what you write down.