I wanted to see if the claim was true but alas, no - with my usual load of hundreds of Chrome tabs, Trillian, Skype, and a few SecureCRT tabs, the x21s with extended battery only got ~3 hours, not the 7 hours or so that some of the reviews claimed it might get under load.

Oh well, back it goes. It might be a keeper if I didn’t like the Vaio Z better for resolution, form factor (usability in coach), and built-in broadband and the Vaio X better for massive battery life with usable resolution.