My experiences with IKEA are not bad. I always had the same contact person during the "IKEA kitchen expert check" over several months. Emails were always responded to promptly, either by callback or email reply.
The delivery took 3 weeks for us, without the countertop. I did not order the electrical appliances from IKEA either. At delivery, one front and 8 door dampers were missing. Assembling the cabinets with the electrical appliances took almost 60 hours. Our kitchen measures almost 13 meters and has three corners; these corners took a lot of time, as did some electrical appliances and the enormous number of drawers.
After the cabinets were assembled, someone came to measure the countertop, all fully digital and in 3D. The delivery of the countertops took another 2 weeks and the installation, including making the cutouts, took 1 day.