I am on the fence about this device. Received it on Monday, which was easy to root and add tethering with absolutely no problem in a matter of about 3 minutes. The screen to me does appear to be much clearer than my EVO but I am having a really hard time getting use to the center line when in tablet mode. Also when you are in single screen mode, the screen seems a bit shifted over to the left too far but this is done this way for Tablet mode.
It is a big drop in screen size while in single screen view and it does seem a bit harder to type (again this is just me). Battery life, well I am glad they gave us 2 batteries cause 1 battery would not cut it!
The phone is a bit heavy and a thicker but that comes with the dual screen, so to each their own opinion on this one.
I do like the dual screen (refer back to my statement above-- Just cannot get use to the center line!), but its the thickness that is getting me right now plus the small 3.5 screen in single mode.
Missing my 4g, and missing the HDMI output ... but the build quality on the hinges are AWESOME. The screen movement feels very well built and you feel every click when you are going from either Tablet mode to Single screen mode.
I think that if there is a second generation of the ECHO and it lost some weight, shrink the center line, gained 4g, and HDMI or DLMA then I would probably go ahead with the next gen. For now though I am holding on to it till the Nexsus S 4g comes out then returning this device unless I change my mind before NS4g comes out.