I have owned 3 29ers in the past 3 years and I have just now gone back to 26ers.
I do like the 29ers but for the type of riding that I do now they seem just a tad too big. I am 6-1 and used my 29er primarily for racing. It was great on long trails where there was a lot of striaghts but really suffered on any course where there was a lot of twists and turns. You just can't excellerate out of turns as fast as a 26er and the amount of energy that you use to get out of the turns is twice that of a 26er. But with that said, with the bigger wheels, once they get going they are sooooooo smooth and effortless, except when climbing.
I even tried a 69er and it was just too crazy and strange.
So....if you are looking for a Cadillac and not a Porsche then I say go for it.
1968 Schwinn Typhoon Deluxe
1984 Otis Guy
1990 Klein Rascal-Owned by Steve Miller
1990 Klein Attitude XT
2010 SSCXWC Raliegh Cross
2012 Black Cat Custom 29er SS