Its Good but there is some issue
I purchased 4th edition of that book. It was really good but problem is happened when they release 5th edition. They stop updating old edition according to ios . At the end i lost my book from my mobile . When i try to open 4th edition i get message that this developer is not updating the book according to iOS . So i even can not open it. So i disheartened . They have to either update their old edition or give the access to user for new edition.
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Response from developer
We wanted to let you know that after lengthy discussions with the content owner, the policy going forward will be changed so that you will be able to access new editions with one purchase. Previously, this was not possible due to longstanding policies that defined each edition as a separate title for scientific and educational content.
