The missus went today. She was very impressed. She's just happy for the club to get out of Wembley as she cannot stand the stadium and additional travel time. From the pics and videos, it does look spectacular. So it should considering the costs involved.
Personally, no matter how good the new White Hart Lane is, it will always be the worst away game in London for me. Shit ground to get away to/from, no decent boozers nearby that allow away fans (dislike the Irish Centre) and the fans are , in general, humourless nobs. Even prefer Palace away. Certainly nowhere near as good a day out as Arsenal, Fulham, West Ham, Chelsea and QPR.