I had several units to be assembled. 2 polite guys arrived and did the assembly of our 3 large Ikea wardrobes. There were some hinges missing and a cracked mirror door which was found when the box was opened. JustFlatPack were happy to order the missing hinges and the replacement door for me and come back and fit it all.
I have just booked them to come back and assemble another 2 large wardrobes and a 3m long BESTA Ikea TV unit.