We got one. Its great for some meals. For stews etc it really makes even a bad cut of meat really tender. We also do pot roasts, soutvlies, etc in it and it gets them so much more tender than doing it in the oven due to the moisture being contained. I'm a big fan. Also like the way you can get all the ingredients ready on a Sat, put it in the fridge, and then dump it in before work and leave it on low and come home to an amazing supper etc.
Still, best feature is how tender it makes meat if you cook it for 8 hours or so in a nice gravy.