As I said earlier, I use different tools for different things. I would never fry chicken in the deep fryer, chips are better in a kettle, but for fries, onion rings, fish, doughnuts, I much prefer the deep fryer. If one had the capacity in Chicago to fry outside on a consistent basis, the story might be different. But even with a yarded house in the City, that option is not really viable. The mess issue is not just a question of splatter, but odor. Frequently, when I use the deep fryer, I am entertaining and I prefer not to greet my guests with stale smell of spent oil. The deLonghi severely minimizes that. Finally, I do find that the deep fryer with a temperature guage is much easier to control than a pot and a thermometer. And perhaps that is because, there is little to control. The temperature is set, when filled, it dips for a few seconds and then returns quickly. This all happens with the lid closed, so I can do something else in the kitchen while not being a slave to the fryer.
But, to each his own, living in an old rowhouse, I have a relatively small kitchen, but a very large laundry room. To compensate and balance, I have created a sort of double decker kitchen by converting most of my laundry room into a pantry. Therefore, I'm used to having to pull things (ice cream makers, stock pots, cake pans) from downstairs. Oh, as an aside, I have used my deep fryer so much that I'm on my second one.