My boss has the K790, and when I showed him my K810, he said he liked it better. Although they are almost the same phone, the design of the rear case seems better on the K810. My boss told me (and I read this numerous times on forums and reviews) that the camera cover on the K790 would constantly open when in your pocket or purse or man-purse or bag, thus draining the battery. I've only had my K810 for almost a week, and I've put it in my rear pocket many times while walking around town, and this has yet to happen to me. I think the re-design was one of the main reasons as to why I held back on purchasing a K790, the camera lens cover being one of them.