My sister gave me mine after my second baby arrived and it's one of the best presents I've ever got.
I find it's mainly best for winter type cooking but it's good in summer too because it saves me from having to do anything in a hot kitchen.
It's a great money saver because it works a treat with cheap cuts of meat.
It's great when I've got a busy day because I put a curry or casserole on in the morning and get home at night to a cooked meal that smells delicious - there's something very cheery about walking into a home full of yummy cooking smells...