I never owned an all-touch phone before, and i bought a Nokia X6 last week (got it thursday) and i've been using it since. I'm coming from a Nokia N85 and i LOVE the X6.
One of my biggest thing on the X6 is the touch screen. I live in NYC and i'm one to visit the Nokia store at least once a month and check out all the phones they have. Well i could NEVER use the 5800 because of it's touch screen. You have to literally press down (kind of pretty hard) on the 5800's screen for it to recognize a touch. With the X6 i sometimes don't even feel that i touched the screen - but the phone actually registers a touch, so i love the screen.
Another thing that i realized from playing with the phones in the store is that the 5800's overall system just seems much slower than going through menus on the X6.
Browsing on the X6 seems faster to me than on the N85. Even though - the reason i came to this thread right now is, i was going to ask, since the update V20 a few days ago, i noticed that when i start the browser it's blank and the loading bar doesn't show up at all up until the page is almost loaded completely.
I've read that people say multitasking on the X6 is not as good because it runs out of memory? Never ran into the problem i can run the music player the browser and messaging and photo gallery at the same time and it's fast to me..
I was also thinking of getting a stylus for the X6, but while browsing, even if i'm zoomed out all the way in facebook or mail and i go for a certain very small link on the screen - i never get taken to the wrong link - well very rarely but if you click on it again you'll be fine..
Camera seems nice - my youtube link, i took the X6 to a club and took some videos - ludacris was performing, there's 3 different vids of it
http://www.youtube.com/watch?v=ctUh6Q4lYBo
I think that's a pretty f'in amazing camera for a phone.