I have had a 4 quart round model for 30 years. It still works, and actually to me is about the best size for 2 people, if you don't want leftovers, but looking in stores, I don't really see that size much any more. It is great for soups and smaller meals. I just recently bought a 6 1/2 quart model which is better for large roasts, etc. One option I did NOT worry about was the ones that have 3 temps, high, low and warm. I always thought 'warm' was 'low'. I also didn't worry about the automatic timer. I don't really think they sell any these days without the removable liner, which is a must!