We have one of these electronic Cuisinart slow cookers.

It's pluses are that it's programmable so that it can get your meal cooked and then hold it and unlike many other models the croc rather than be low and wide is tall and narrow which means it's great for small quantities as well as large. With the low and wide types you have to add too much liquid to cover any proteins and veg whereas with this shape you just have the liquid you need. Three heat settings - high, low and simmer. It's used very regularly.

Costs more but worth every penny.