I owned a n800 and now a n810 and just purchased the Viliv S5. I really like it but can't compare to the form factor of the n810. Miss the sliding keyboard. Batter is incredible on the s5, over 5 hours of full use and watch 720p movies is awsome. I bought the s5 mostly for running streetdeck in the car and for portable movie player that is capable of browsing the web, ect. Hate that I can't run Linux on it, no touchscreen drivers. StreetDeck is a great in car GPS/MP3 player, although an expensive one. check out my blog for more on Viliv S5, http://philwiltux.blogspot.com/.