Easy there everyone
I get that we're all passionate about our devices and I'm right there with you. We've also all got our likes and dislikes. I've also learned to accept that what works for one person may drive another person crazy.
Do I think the Sony devices are good? Absolutely. I really like how they've implemented the new touchscreens (tech bought from another company.) I do think it's easier and more intuitive to use a touchscreen for navigation of menus and selection of things on the screen. Double-tapping to look up a word is a perfect example of the strengths of those touchscreens.
That said I have used both the Sony devices (350 & 950) and the Kindle 3 so when I decided to "settle" for the Kindle 3 I'm aware of what I'm really choosing.
For how I normally use an ebook device the Kindle will work just fine. Remember that I'm coming from a Sony 505 which is also button navigation, but slower than current generation devices from Sony and Amazon. I also like the better native font options on the Kindle. I know how to control fonts on the Sony's and I've been doing so for a couple years now with my 505, but I like that with no work on my part the Kindle already has more and better options.
In the end, the whole point for me is about reading novels. That's exclusively what I use an ebook device for at this stage of my life and for that my only real requirements are a good screen, quick page turns and comfortable to hold for long stretches. So for me Amazon vs. Sony mostly came down to price & availability.