The double-sided grills are pretty much a one-trick pony. Add food in the middle, close, wait, remove food again. Admittedly you can subject various foods to the treatment, but in the end, you get similar results, hot food with sear marks.
As soon as you want something slightly different, you are outside the thingy’s capacity. Just a few things you can do ...
Advantage: It cooks from both sides.
Disadvantage: only usable for small items; takes longer to clean; moving parts; take more space (cupboards or counter).
About electricity, it depends where you live. (for example, in Québec, electricity is dirt cheap)