I have an IKEA kitchen, it's about 15 months old now and I'm very happy with it. We have two full height appliance units, 7 base units, 8 wall units, Veddinge White doors, blankett handles on the drawers, push openers on the cupboards and Hallestad worktops. We have 18 drawers in the base units. It came to £2k. We fitted it ourselves and it is as solid and well fitted as my parents Howdens kitchen.
My parents have a Burford in cream with the better oak effect laminate worktop, they have the standard hinges and drawers. They used a good fitter and it looks lovely; they are not as impressed with the Lamona hob and oven though. It is 3 years old, but was fitted as part of some building works too, so I have no idea what the kitchen actually cost.
Our hinges and drawers are all Blum and soft close as standard, which is what Howdens use as their upgraded ones. They are far better than their standard ones, so if you opt for a Howdens kitchen go for the upgraded hinges.
Our kitchen was delivered with no damage and everything was there. I have no idea about my parents kitchen, but Howdens do stock everything, so it is usually just a case of taking a faulty item back and swapping it there and then. I found IKEA good for returning and refunding extra bits we didn't use (eg I ordered an extra internal drawer we didn't need).
I wanted a modern and fairly minimalist kitchen which IKEA allowed me to achieve at a fairly modest cost. IKEA also had open pricing without haggling, Howdens prices depends on what discount your builder / fitter gets and how much of that they pass on to you.
Howdens units come assembled with solid backs, IKEA is flat packed and just have hardboard backs. I've read that the units don't need solid backs to increase their strength, and ours is certainly solid! Both carcasses are 18mm thick and I think are the same material (MFC). IKEA use a fitting rail like the German kitchen brands and dont have a void at the back of the units, but it isn't difficult to re-route utilities below the units.
I was happy to design my kitchen myself, though I think IKEA do have a design service.
I hope that helps it probably doesn't! 😀