This was a pretty quick read. Kondo has her own method of tidying up, and from what I've heard before reading - you either love it or hate it. I'm somewhere in the middle.

A few things:
-I think there is a lot lost in translation/culture. Some of her claims come across as a tad bit arrogant in western culture, but I don't think that's her intention. This might be a cultural barrier.
-As a couple without kids, Kondo's methods seem realistic for me. I'm uncertain how this would work with a family - but I really like the idea of each person doing his/her own stuff.
-I like the idea of de-cluttering in one long swoop, but Kondo and I were both weird child organizers. ;) I can organize for a long time, and I enjoy it!
-I've researched "letting go" of sentimental items (my mom died several years ago, and I've purged most of her stuff), and actually think Kondo is pretty gentle. I "get" the idea of saying goodbye or "releasing" things. I've broken the rule of giving away and have given items to friends or my church, but knowing that these people DO get joy out of these items is worth it to me.
-I disagree with Kondo on papers and books -I'm a words of affirmation gal, and I keep lots of old cards (which she admits would be categorized in memorabilia rather than papers). I am planning on getting rid of some books, which is scary, but necessary (I'm a renter and not "settled"). And files.

I'm skeptical if this method is the answer to life, but I really like the idea of only having things in your house that bring you joy (and that can be a perspective thing - medications, etc.). Some people might have more things they derive joy from - fine with me! :) I think if it helps you, that's great.

I'd be interested to hear her take on tidying one's digital space...I'm sure that's coming soon.