I've never had any trouble with anything purchased from Ikea, aside from one time when I opened a box to discover half the panels smashed with dirty foot prints on them.
I wrote them a polite email explaining the problem - without fuss they (in a huge HGV!) delivered a new bedside table straight to my door and collected the replacement - considering I am a good 100 mile round trip from this particular store I thought that was excellent service. When I wrote to them to thank them they actually took the time to write an individual reply, and passed my thanks on to those who were directly involved with my 'case'.
A+ for Ikea!
Alex