Nice chairs.  They were a piece of cake to put together.  I have seen reviews by other people that some of the chairs are hard to put together or that they wobble.  The key to assembly is to just get all the screw just barely started.  They start to tighten them.  If you tighten them as you assemble it will be really difficult.  For uneven legs I would loosen the front legs and see if you can put something on the chair so that they slide up or down to an even position.  One of the chairs I had to switch the two legs and then they were fine.  Definitely assemble the chairs one at a time so that you don't get the legs mixed up with different chairs.