inputs.text: bookeen opus vs kindle k3 vs sony prs350 - currently three sitting front k3 biggest heaviest although not much k3 6\\ screen keyboard whereas opus prs350 5\\ display no keyboard k3 offers g3 connectivity addition usb whereas prs350 opus usb kindle owner buy books anywhere world g3 connection works addition transfer free ebooks found gutenberg project manybookscom get correct format one important aspects ebook readability screen thats see generation difference opus sports first generation eink passive display whereas prs350 kindle k3 second generation displays k3 display passiv whereas prs350 touch sensitive reduces contrast slightly held next k3 far best screen followed prs350 opus difference noticeable dim light still easily read k3 prs350 lesser degree opus requiring clipon light haptic experience prefer k3 opus prs350 latter metal frame feels cold addition touch sensitive screen pay attention not touch screen inadvertantly summary k3 clear winner terms ergonomics overall consumer convenience followed opus trailed sony prs350 purchasing ebooks use pc not k3 pc screen keyboard still superior browsing experience however due g3 easily access ebooks purchased amazon usd 000 higher k3 smartphone etc without needing connect k3 via usb also find advantage able keep purchased ebooks amazon download whenever want dont need think backing ebooks