I could live without a SD card, even though I put music and photos on it. 2G would do for now, but not forever. I could live without the replaceable memory. I would probably upgrade to K4 before the battery gives out. But with no folders, I have no reason to upgrade. Yes the text to speech is cool and with be an enormous help to blind folks who want to read, but will be marginally helpful to most people. I wanted a reason to upgrade. The thinner design is nice, but I'm not thrilled with the larger footprint. It seems to be about the same weight, so all they did was rearrange the parts to get a different form factor. Faster page turns are nice, but I'm used to the K1's turns, so its not a big deal for me. I really wanted to upgrade, but they just didn't give me a good reason to do it.
Steve