I had a small cheepie 3 qt Rival for about 10 years that worked great. The plastic handles were cracking. Before that one I had several other slow cookers that worked great. Put a meal in and come back 6, 8 or even 10 hours later and the meal is ready.
I really wanted a slightly larger capacity so about three months ago I bought a Rival model # 33511 5 qt.
On the "Low" setting his slow cooker boils your meal dry burns it beyond consumption! The "High" setting is useless for slow cooking and brings things to a hard boil. This is the setting to use to ruin your meal even faster than cooking it on th low setting. There's no way you can leave this cooker going for 8 hours without it cooking your meal to death. It also has a "Warm" setting which keeps the food only slightly above room temp. I surely wouldn't let the food sit at this setting for more than 20-30 minutes without fear of it spoiling. Maybe this setting would be ok for a cheese dip but not for anything like a roast. I would highly recommend not buying this one!
Did Rival lose the formula for slow cooker design?
I'll be out today looking for a replacement today.