just ran across this forum while looking for some info on a new MTB I purchased earlier this week... I decided to get into a 29er single speed and found the Gravity G29 FS from Bikes Direct.
after a 1/2 hour of assembly I was riding down the street. Very impressed with the fit and finish.
If there are any other members riding the Gravity G29, I would like to get some long term feed-back on how things are going.