I think that some newbies might get confused about the double tap. I noticed that I had a double tap habit from Windows, and that frequently meant that I double tapped links and was surprised when I didn't go to the page the link is supposed to go to. I has taken me some time to unlearn double tapping to get to a link and remember that double tap is a zoom function. Remembering to only single tap is the key to getting somewhere; double tap is for zooming.