I've got to say I've been mostly happy with the 700 so didn't really consider ditching sony. Their software is annoying but i use calibre anyway, and as such buy my ebooks from anywhere.
On the 700~
- I've liked the touchscreen,
The battery life is very good,
It feels sturdy,
The built in light works for me, although it eats the charge,
I've never had my hands on a kindle, I've don't really 'get' the point of a keyboard, they look 'plasticy', but the wifi would be nice.
Tablets (of any brand) are (to me) neither one thing or the other. They don't do as much as a laptop, aren't as pocket friendly as a proper ereader.
I am curious as to how much of a difference the smaller screen on the 350 makes to reading though.
EDIT~I luv you Grammar