The sensation of speed is completely different (and better in my opinion) with a 3d setup. I've used shutterglasses from eDimensional on my old 19 CRT monitor a couple of years ago and LFS was one of the few games which benefits from the three-dimensional view.
If I wouldn't get massive headache issuses after wearing shutterglasses longer than 20 minutes I would most likely play LFS solely in 3d.