There are times that I saw my Cuisinart coffeemaker was working a little bit slower than usual.
It also would not brew a full pot of coffee even though I was filling its water chamber full of water. I then unplugged and did a thorough check of the whole unit and saw that this unit had the fancy filter.
I had not remembered it was even there when I first set this up. It appeared clogged with coffee grounds, I then removed the old filter, which was not that old, and then it worked fine, and brewed the whole pot so fast like on its first day.
I think if your water is bad, you could spring for these filters, but if you are taking already filtered water from the fridge, there is no need. This is the best pair for my Cuisinart brewer.