I have an N810 and....another N810. (; 1.) With OS2008 the N800's processor was "overclocked"* to the same as N810, so I'm going to go with same. *=actually not overclocked, the underclock was just removed 2.) I am very interested in some data on this. I got an external antenna for my N810 cause it's internal antenna is not powerful enough for my needs, yet people claim the n800's is spectacular. We want data! 3.) Same CPU, same OS should be same. 4.) OS2007 can run on N800. But there are a lot of fixes in Chinook and Diablo (both are OS2008). 5.) This would depend on battery and what is installed/running and use. I couldn't even compare my N810s unless I conducted a scientific trial. But again I own not a N800. 6.) N/A for me (though I will say I wish the N810 had the dpad on the non-slide part; also a rotatable camera would be nice; also minisd is crap and I keep breaking my microsd=>minisd adapters)