I've had a few deep fat fryers in the past, but got rid of them as I hardly used them and they took up too much space. On the very rare occasion I need to deep fry something I'll use oil in a pan - size and shape of which depends on the size and shape of what I'm frying. For things like schnitzels I also tend to only partially cook them in the oil - just until the coating is crispy, and then finish them off on a rack in a hot oven.
The Actifry is great for things like chips and fried potatoes - they come out almost as good as deep fried ones but with far less fat You can also use it for ready-made breaded/battered items (mushrooms, chicken, fish etc) if you take out the rotating paddle, but you can't use it for making those kind of things from scratch.
In terms of size it probably takes up as much space as a deep fat fryer, but its much easier and cleaner (no dirty fat hanging around) so I prefer it.
I'm still debating whether I can make space for the Actifry. Its that 'would I use it enough?' question. But thanks for the info.