I want to get into the Foundation Trilogy, and was going to purchase the Kindle editions from Amazon. But a reviewer brought to my attention that all the copies in print these days are of the "revised" edition. He quoted a couple places that didn't seem to alter that much, but I read another comment that mentioned entire conversations had been edited out.
Does anybody know what and how much content has been cut out of these novels since their original publication in book form? Is it enough to matter? What was the motive for this?