As flat packs go, this was about on a par.  I must add, though, that all the pieces were very clearly marked and easy to identify - a real plus.  The instructions were OK, and where they were not detailed enough, common sense filled the gap.  The unit is smart, arrived in good condition and I am pleased with this purchase.  Our cats are getting used to it (we have 2) - so far the main attraction is that it is somewhere different to explore.  By day 3 they are both using it as intended.  A good purchase.  Final point - it arrived on time.