more like 90% working
http://www.tonycrapx86.com/viewtopic.php?f=170&t=28509
http://www.insanelymac.com/forum/index.php?showtopic=261313&st=0
Basically everyone gave up on it because of lack of a working sleepenabler.kext and price point makes it not as popular as others. However with the workhorse that the E-series is, I would rather not sell it and get a less powerful laptop if I can get sleep working.