Love my iriver Story. New Zealand has just got it's first offical ebook reader, the Kobo, and can tell you the iriver Story beats it hands down.
Have for far about 80 ebooks on my Story, most free, some bought. Had a lockup once, but a press of the reset fixed this, not leaving my iriver Story on. I get over 2 weeks reading easily. In around 10 days only down to the second bar, so maybe more like 3-4 weeks on a charge, never timed it.
The iriver Story is up there with the best of them, but why compare it to a Kindle as many reviews do, it's not, who needs an ebook reader connected to the internet. It not nessesary, when your ebook reader is in your computer, you can find ebooks and download them to your Story anyway.
Here is an interesting link, who says the iriver Story is slow? Faster then Sony, here is the link:
http://www.youtube.com/watch?v=KCN5oFA_Al4