Aren't you the kid with the $6000 Giant road bike that uses it to ride around town for fun?
I'm not a weight wienie at all, in fact the bike weighs around 25.8 pounds while the full suspension, 26inch race bike that i used to use weighs in at 24.5
To the kids who say its useless for anything but street: You can't hate until you've tried.
Also, uphill is hard yes. Thats kind of the point of the singlespeed, to make you work. In my mind it's a pay off though. Downhill is a lot of fun. The 29inch tires are almost like having some suspension on the kid. They role over everything and I have the wheels mounted with 2.55 tires which add some cushion on rocks and such.