I love my IPad having been a big e-ink fan since the sony libre (remember that). I have never looked back since swapping over , each device has + and - however the Ipad works better for my use case. I agree stylus support and hand writing recognition would be great but I think the capacative screen cannot measure input to that level of detail yet
Anyway I love my Ipad , and the PRS505 was sold on ebay this week !