When I first started using my Kobo H2O, I had many freezes, at least once or twice per book. I would tap the screen to turn a page and the page would not turn, I would tap it a couple more times, then I would try to go the other direction or bring up the menu and nothing would happen. If I put it to sleep and woke it up it would jump several pages and be working fine.
However, for the last month or so, I've not had any problems at all. I used to think my freezes were due to my reading sideloaded books. Now I think, and I do not know if this is true or not, that there is a learning curve to the art of touching the screen correctly.
The bottom line is I am quite happy with my Kobo. And like others have said, it really depends on how you plan to use your ereader. When it was time to upgrade my old Generation 4 Kindle, I opted for the Kobo H2O over a new Kindle because it was waterproof and I sideload almost all my books.
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