We use a Brita and we are constantly having to refill it, not that it's a big deal but the pitcher is so small it feels like I'm doing it every few hours. I was curious about those filter systems (like Brita, Pur) that go right on the faucet. I saw one on clearance at the store today but didn't want to buy it before hearing from others how it worked.

Does anyone have one of these, do you like it? Bonus if you've used the pitcher version as well and can compare!