FWIW I purchased one at the beginning of this year, secondhand, for about $250. It's been fantastic for me. I used to keep physical notebooks - but I was just taking small notes or keeping a running list (I still do this, just better now).

The editing is what really makes it useful - instead of wasting paper after writing some scratch math, I can just select the area and clear it - giving me a fresh page with all the info I already had on there. It's been pretty great for my use case, maybe a little expensive - but I've used it every day so far.

It is 1 level up from traditional pen + paper IMO, editing / moving things around / bulk erasing is a major upgrade that I didn't know I wanted.