I have the Sony VGN-P699E with the 256gb SSD. I've had it for several years and like it a lot, but use it seldom -- I use the thinkpads in my signature instead. I keep the little "pocket pc" on my desk, and updated running Windows 7 Home Premium, and have taken it out a time or two in the first year I owned it.
Although it's a really neat little machine, it's processor is the Intel Atom Z540@1.8ghz, so even on the SSD, it's not speedy -- fast enough, but not 'snappy' -- It runs Windows 7 Home Premium without problem.
Bottom line on the Sony Pocket PC -- it's on even par with my ThinkPad X100e (which also runs 128gb SSD) and my IdeaPad S10 -- downside of the X100e is heat, but hasn't seemed to slow my machine down, and no thinklight -- downside of the S10 is no trackpoint/no thinklight.
Not sure how much you are interested in the Sony Pocket, but I sold one here on the Forum a year or so ago. If you put a WTB in the Marketplace, that purchaser may be ready to sell -- if I remember correctly it had a 128gb SSD -- but that reminds me of another downside of the Sony -- I don't think (but not sure) it is as user friendly as the ThinkPads or IdeaPads -- changing ram and hdd/sdd is not intended to be done by the user -- if you are a true geek **which I am not
** you may be able to access and upgrade -- but if your geekiness
is like mine/below average, then the ThinkPad or IdeaPad could be your better purchase.