Are immersion mixers a new thing over there? I'm surprised, since we've had them for at least 30 years, probably more. New gadgets usually hit Murrica before Sweden.
Anyway, I have one, don't use it very often, but when I do it's great. Saves you a lot of dishes, and pouring things back and forth.
The food you use it for has to be at least semi-fluid, otherwise it won't work.
And please don't forget to immerse it totally, otherwise it will spray all over your kitchen.