Thinking of getting a [[http://www.amazon.co.uk/gp/aw/d/B000WZQCVY/ref=redir_mdp_mobile?keywords=crockpot%205.7&qid=1383428182&ref_=sr_1_1&s=kitchen&sr=1-1 Crock-Pot Sauté Countdown Slow Cooker, 5.7 Litre]] from Costco. Reviews are very mixed. Any experiences/opinions/advice?