Just got my memory stick. A few comments first:
1)the memorystick is SLOOOOOOOOOOOOW! Compared to my 133x SD-card, it's at least 50% slower to write or read.
2)Sony has become cheaper. No longer are they shipping an adapter with the stick.
3) The reader does not support 4GB memory stick, despite the stick being listed as supported here
http://esupport.sony.com/EN/info/mspro-reader.html
Also... just like when you fill up a 4GB SDcard. if a stick is filled up to 2GB where the reader can't even write the formatting data, the reader will crash...
/me disappointed.
And even if the reader does support 4GB memorystick,it's so damn slow loading that you shouldn't bother using memorystick instead of SD-cards. Where an SD-card read a large book fairly fast (within 1 minute), the memorystick would need a couple of minutes.
Anyone care to give Sony a call about this?