I am a veteran of several trips through the Harry Potter saga, and each time I enter the world of witches and wizards I am amazed at Rowling's wizardry in creating this rich, and exciting tale of a boy and his friends' adventures and maturing. If escapism is your goal, the Harry Potter series is a great choice. What I appreciated about the Deathly Hallows is the confident plotting. The story flows, and the sins and omissions of the characters are rewarded and punished. I like the series -- a lot. If there is anything annoying about Harry Potter is his sheer dumb luck. Very few literary characters have managed to squeeze out victory against overwhelming odds.
By all means, buy the series for your Kindle and have a wonderful world waiting for you whenever you need it.