I bought a Morphy Richards one last winter (you can use the inner pot to brown first) and it's one of the best things I have ever bought - I use it all the time. I have discovered that Morrison's sell ham hocks (£1.99 a kg), and I put the hock in the slow cooker, leave it on medium all day and then remove the hock late afternoon and allow it to cool. I also keep some of the cooking liquid from the pan. The following day I remove the meat from the bone and put it back in the cooker with the stock, carrots, onions (any root vegetables really), and some dried soup mix from the supermarket). It makes a wonderful broth - it'll be ready for us to eat with crusty bread when we come home from the match on Saturday! One ham hock will make broth for six people (and I bought two hocks this week for £2!).
I am pleased that I bought a reasonable size one, as we always make a meal and freeze a meal from it.