Bests & Worsts Reviews from Amazon

I am presently making Sunday dinner in this slow cooker. Three pounds of grass-fed corned beef, carrots, new potatoes, onions and celery with lots of garlic. I started the beef last night because it was frozen and let it cook, with water, overnight. When I got up this morning the pot was bubbling away on the "low heat" setting. I added the vegetables thinking that the boiling would slow down with the addition of the extra food, and it did for a while. But a half hour later the whole pot was boiling away again. Now this is a full pot of food, maybe an inch or two down from the rim, and I say that because I know it can make a difference in how a slow cooker heats the food if it is only half full. Being concerned that the food was boiling and not slow cooking and thinking that maybe there was something wrong with the controls, I switched the setting to "high heat". Ten minutes later it continued to boil. No discernible difference. So then I switched to the "keep warm" setting, came back to check a half hour later and it was STILL boiling. I had to turn the unit off or end up serving overcooked food. Did I get a defective unit? Possibly. But I cannot recommend. Mine is going back.