i love my reb1100. 
there is a public release macro that will convert anything you can open in word to the rocketbook format. 
this screen is quite a bit larger then PDAs, i've got a toshiba e335 and a ipaq 3835 and reading on the ebook is sooo much nicer then on the pda. its not too heavy, so your legs dont fall asleep if you have a habit of reading in the bathroom. its backlite, so you can read in a darken room and not awake your mate. i have an 128meg smartmedia card in mine, so it could hold about 250 books total.
but buyer beware, gemstar, the company that sold content for this device just closed shop. so you would not be able to used the build in modem (which cantact gemstar) to buy books.
they were 399 when they first came out a few years back but they are out of production now,  so 135 is not bad. the serial number doesnt matter anymore since gemstar closed. you may find new ones in box for around 200