Welcome from another Sony Reader user in Japan! I have just recently received my Sony PRS-700 and I'm very happy!!
Yes, books almost made me bankrupt AND homeless, since the books take up more space than anything else and there was hardly room left for me. Japanese houses are meant for little Japanese books, not HUGE gaijin ones
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I am so happy NOT to be filling the coffers of Amazon.com anymore as that is where I bought most of my books from in the past!