The original date on this thread is 2013 but looks like it got spammed and it has re-launched.
I had an Ikea kitchen fitted 2 years ago and love it. I liked their pricing because there was no "sale" price, just this is a cupboard and it costs X, the door costs Y add the two together. Do you want stainless steel feet? Or plastic things that hide behind the plinth?
It was easy to design and order, I had a local fitter install it as I had a kitchen extension built and Ikea wouldn't come round and measure up until they had knocked through. I just guessed the measurements (I live really close to an Ikea so it was easy to get stuff or take it back)
But we only bought the cabinets and extractor from them as the extractor fits inside the cabinet. Appliances were Whirpool and we just double checked the measurements as Ikea supply Whirlpool but not the ones we wanted. They came from AO (appliances online)
Worktop from an Axiom supplier, tap, sink, hot water tap, lighting etc all sourced on-line.
Flooring from local company and sockets/light switches from Toolstation.
Total cost for the kitchen was about £9k but it is 6m long kitchen plus utility for lighting and flooring. Cabinets cost £3.5k. My induction hob was £850 though. No regrets.