I've posted about this bike before, but here is the run down.

I've had a critical fixie for nearly 2 years now. Its a good bike for the price but the quality of some of the components run the cost up a bit, i've spent about $100 fixing/upgrading parts. I added a front brake, changed the gearing as the gear ratio is too high for the sake of your knees, and changed the handlebar as it broke on me.

My rear bearings (Quango hub) failed and it is impossible to find replacement cones, so I have just installed new ball bearings for the time being. I've heard this may have been because they were adjusted to tight from the factory.