i've just fitted crud 2's to my fixie, i've massive amounts of room for full size guards, but it'll be easier to get the rear wheel out with cruds. i'm really chuffed with them, the front is way longer than other guards (runs closer to the ground). however, for the front i've had to make a bracket (too much clearance) so they aren't sticking out as far in front of the brakes as shown in the pictures.
i'll see how they are tomorrow on my commute, they look better than i thought they would aswell. the best design part, the bit next to the chainset, it's kinda extended round to provide more protection for the chainset, not too important on a fixie (tho less crap into the bb is good, i suppose), but i bet people with front mechs really appreciate it.