We're just about to completely overhaul a kitchen, and I was looking at an entire Ikea suite, where we place all appliances (washer, condenser dryer, dishwasher) below the worktops, and all proper cupboards around the walls. I'm interested in what you mean by their stuff having no 'service gaps'.
Do you mean that when installed, the 'shell' gets pushed in flush with the wall behind? If so does that mean that any relevant hoses and cords have to run inside the cupboard?
Finally, I'm not sure what is meant by appliances 'standing proud'. Does that mean that it will be hard to fit them inside the space under the worktops, and to have doors in front of them?