I think the biggest challenge for me going from pbook to ebook was the ability to share & look at my books, or maybe it was a bit of 'look what I have' (sad to admit), books have always being a big part of me, I have read for as long as I remember. At primary school I read over 300 books in about a month for fundraising.
One of the reasons I bought my ereader is because I need to clear out 'stuff', having just had a 2nd child, there is no longer room to store things that don't get used on a regular basis. I have decided novels are going, I will still have heaps of pbooks from my travels, plus other books which would not be available on my ereader. So for me the main reason for the switch is to minimise, but for me I am going through a stage of doing this with everything not just books.
Only having had my ereader for less then a week, I can say I am currently loving the ease of using it, sometimes after turning the page I will look at the left side of the case to start reading
, old habits die hard.