In my own kitchen my slow cooker was indispensable, especially when I was having family/friends in. Freed up my oven and burners for other things.
Get one with removable plates. Mine doesn't have them and it is a PITA to clean.
Also, if you are cooking for more than 2, expect to be making waffles while everybody else eats and sometimes come back for seconds before you get to sit down, OR get more than 1 waffle maker if you expect to make them frequently for multiple people.