Out of the box my kilo did not feel cheesy at all, have you owned one preston811? Some of the parts were cheap and clearly needed to be replaced fast, but this is the case with most new bikes. Most of the parts are perfectly rideable if you have decent mechanical skills.

And Ill bet money that in a blind test between 520 and 631 tubing 90% of people on this forum wouldnt be able to tell the two apart. Especially to someone new to fixed gears/bikes.