Enjoy your Sony. However, as someone pointed out to me, and I have been pointing out to everyone else ... there are factory refurbished Kindles with the same 30 day return option and same 1 year warranty available for $329 and which can be delivered next day .... or within 5 days with free shipping.
So ... if you decide you don't like your Sony, and want to try a Kindle, there is no need to wait for three months to get your hands on one. And, if what you want is easy access to bestsellers .... then I'm not sure there's a better choice.
However, since you have ordered your Sony, I really do hope you are pleased as punch with it.