Remoskas

Has anyone got one of these, and if so, are they worth having? Which size did you go for if you do have one? My DH keeps looking at them whenever we visit a well known kitchen store, but so far we’ve not bought one. I understand they are very economical electricity usage wise, which might save on using the oven to, for example, roast a small chicken.
If you do have one, what do you cook in them regularly, and do you use them often or are they another one of those gadgets that’s a “one night wonder”, that then gets relegated to the back of a cupboard? I already have, and use regularly, a slow cooker. On the other hand, I have a pressure cooker that only comes out to cook the Xmas (sorry ?) pud. I wouldn’t want a remoska only coming out on such occasions, they’re not cheap to buy.
We like to self cater on many of our holidays, so it might be useful for that, too.
Thanks in advance for any objective opinions.