When I saw a Langstger in the window down at Valencia Cyclery (San Francisco) for $450 awhile back, I had to try it out. The bike lanes on Valencia are bumpy as hell and that thing was HARSH. It also made a weird pinging noise when I hit those bumps. It had no room for bigger tires to mitigate the ride, so I gave it a pass. I ended up building my own Surly Steamroller and it is sweeeeeet. The steel frame is much smoother and it has plenty of room for bigger tires (I'm running 28c right now). I run a 42x16 gear, which works for all but the most ridiculously steep hills that SF is famous for. I also run a front brake, which I highly recommend for descending hills and panic stops.

When you ask "would it be cool for long road rides" I assume you mean fixed gear bikes in general. The answer depends on you. In the city I prefer the Steamroller, but when I go on longer road rides in Marin County I take the geared bike. As much as I love riding fixed, gears and freewheels can be awfully nice sometimes.