I'm like Frogsmasha - ready to buy. Not that I think the Sony will be perfect, but I desperately want a PDF reader that I can store large numbers of PDFs on. I have a Nokia 770 but it just doesn't cut it, for a number of reasons.
An iRex would be great for the increased resolution and the note taking and annotation capabilities - but it is out of my price range and it seems a number of people have had hardware problems with their units. Jinke don't seem to be making any progress - I've sent them mail three times in the past several weeks and get the same stock reply each time. Sony has the big advantage of being a global company - if something goes wrong it should be easy to return/replace; who knows what the situation would be with Jinke. So a Sony it is. They're a big company and I don't hold the consumer electronics division responsible for the rootkit debacle; the memory stick seems to be their biggest SNAFU so far. My experience with Sony electronics has generally been good (especially their video cameras).
So c'mon Sony - release it already! Or send me a unit to beta test - and I'll show it to all my MSFT buddies and get them jealous!