Absolutely - DSs drink far more water now they can help themselves from the water dispenser in our fridge. The ice dispenser is a great attraction too. Ours is a plumbed in version. No parental intervention required when they're thirsty
Yes but my mother broke it, I suppose it does say in the instructions not to be used by young children and the elderly! It is under a cover plan (thankfully accidental damage is included) but I just haven't got round to phoning them. DS2 went through a lovely phase of covering the kitchen floor with ice cubes and water, whenever our backs were turned but thankfully the novelty seems to have worn off.
We have one which is plumbed into the mains, but the water runs through a complex water filter before it's dispensed. This makes it taste wonderful! My kids are a little young to work it themselves but we definitely drink more and their juice is made with the filtered water. They love the ice maker as well.