If you are happy with your Sony then don't worry about changing. When the time is right, you will get a new e-reader and be amazed at how nice it is but until then, use what is working for you.
I got the PW2 because I wanted a front lit e-reader since I like to read in bed and when rocking my baby boy to sleep. I found that I struggled to focus on a book with my iPad, email alerts, video games at my finger tips, facebook, Mobile Reads, all far too distracting. I could not read on my K3 in a dark room, so no reading while rocking baby boy to sleep. The PW2 fit my needs so I went for it.
Upgrade when you think you need to. If what you have works for you, then enjoy!
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