I got one of these the last time it Wooted, and I'm really quite happy. I'll paste in the review I left on Amazon:
I already had a Logitech Squeezebox, but I picked up a Sony Dash as well for $60 on woot.com.
I was pleasantly surprised. It's not as responsive and easy to use as the Squeezebox, but it makes up for that with the large touchscreen. As other reviewers have noted, the on-board software is on the slow side, I suspect because it fetches everything from the server, but it's not unreasonably slow for something that you're not actually supposed to fiddle with all the time. It would be nicer if it could stay logged in to your email/Facebook/whatever so it didn't have to do that again every time that widget comes up. It plays Netflix like a charm; though the built in speaker is poor, it's good enough for its purpose. Chumby must still be supporting it, because it handles Hulu Plus and Amazon Prime videos, which didn't come out until recently.
The weakest part is probably the web site setup. The site is unaccountably slow, and doesn't show a loading indicator, so you click... and wait... and wait... and then decide to click on something else, but the first thing you clicked on eventually comes through. Still, you're not _supposed_ to be messing with it all the time, this is meant to be a set-it-and-forget-it device, so that's not a big dealbreaker. The same applies to the lack of battery - sure, you can't move it around. It's not supposed to move around, it's supposed to sit on your nightstand.
Finally, the design is classic; sleek and sexy, particularly side-by-side with the Squeezebox. If Chumby keeps supporting it, this will be an attractive addition to your nightstand for a decade.
All in all, it's a great product. At the original $200 price, it's a tossup as to whether the Squeezebox is a better deal or not - the sound isn't as good, but it's got the bigger screen and movies. At a lower price, the Sony Dash is definitely a win.