We had our old Ikea kitchen for 10 years and it wore really well, just had a new one fitted at the end of last year and I love it.
Planned myself using the old-style online planner, which they've just replaced (but I did spend hours and hours on it...) and fitted by my own builder. We have Ikea carcasses and internal fittings, with Shaker Doors (Foxstow) fronts, who were amazing.
Got our taps, sink, handles, worktops and appliances elsewhere with the exception of the Ikea Vinterkall fridge freezer which I absolutely love, it's about twice the internal capacity of our old integrated one (or seems it anyway!) but only 83cm wide. We also raised the units slightly to allow room for plinth drawers underneath (Ikea plinths are 80mm and ours are 120mm).
The carcasses are really solid and the choice of internal fittings is brilliant, we have drawers within drawers to maximise the storage space and I love how deep the cupboards are. You will need a good fitter to ensure the build quality of course, but for us the key was versatility and the ability to make something really unique.
I had my ups and downs with the customer service; the ordering was great, really helpful planner at Wembley, and delivery of the units was fine, but we did have a bit of a nightmare with one of the subcontractors they used to deliver the fridge.
Otherwise though I'd 100% recommend them, the kitchens themselves are excellent.