The focused nature of this device is exactly what I needed. It really is as straightforward as using a notebook, but with the added benefits that I can erase, copy, paste, rotate and resize my scrawling... And my lines are straight too!
I use it for my daily journalling practice, and it's absolutely perfect for that. I intend to start exploring its capabilities as a sketchbook soon as well.
The on-device character handwriting -to-text conversion seems pretty flawless to me (and, when it does get it wrong, I can understand why it misunderstood my awful scribbling!)
All in all, I'm very happy with it, yes it was an expensive purchase for me, but at the rate I go through my journal notebooks, it'll pay for itself in about 2 years! (And I can still print off and bind my journals, if I want to, for posterity)