Customer Rating: - Brita from Amazon - GREAT
I purchased the Brita filter replacements from Amazon because the three (3) local area Target Stores were stock out, so I decided to check Amazon. It turned out to be a GREAT idea, it was $2 cheaper and came with free shipping, so I got my filters delivered to my door in 3 days for less money, time, and gas than purchasing at the store.

I'll be checking Amazon more often as my first choice of any purchase over $25, with free shipping and their awesome prices -- it's a steal!

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Customer Rating: - Much better than Pur
After using Pur faucet-mounted water filters for years, and having to replace them every year or two due to cracks or leaks, I finally tried Brita. Much better design! Easier to replace, no leaks, no cracks, same water quality. And through Amazon, better price.

UPDATE:

Several months later--no problems so far. One quirk of the Brita, however, is that when it's in filtering mode the stream of water is quite narrow, and forceful, so it can easily bounce off whatever it's hitting and spray around. Filling ice cube trays, for example, requires a little practice to actually have the water stay in the compartments instead of spraying everywhere else. But really, this is nitpicking. Still prefer it to Pur. And it also takes up a little less space under the faucet.

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Customer Rating: - Amazon wins over CVS on price, and the Brita filters are easily the best.
New York City has exceptionally clean and tasty tap water, but running the tap through this filter makes it so much cleaner. When it comes to consuming pollutants, you can't be too safe.

That being said though, filtering all your water is quite expensive especially when you have a stay-at-home spouse like I do (and my wife is from Japan, which has the highest per capita water consumption in the world). At CVS these filters cost over $22 each (that's one per package!); that's almost prohibitively expensive particularly since we use ours for literally all the water we consume for drinking and cooking (not cleaning of course), so we go through probably 1 filter per month where many might go through 2 or 3 per year. Simple math: 12*22=$264 per year. On Amazon it's $25 for two, so we pay $150 per year, or a savings of $114. Truth be told, my wife might be changing out filters faster than that because the flow dwindles down to a trickle before the indicator on the faucet attachment indicates it's time to change, so we save exponentially more money by buying them from Amazon (with free shipping due to my Amazon Prime membership).

Home economics aside, I am just astounded by how well this filtration system works. The water is, without exaggeration, crystal clear. New York City tap water is already purer than spring water, and yet we can see and taste the difference between the tap water and filtered even if it does little more than remove chlorine.

I would still be fine with straight tap water except that my wife has horrible allergies. And while the water wont trigger an allergic reaction, she is noticably healthier since we started using the Brita tap filter system.

BOTTOM LINE: Our Brita filters are now a household essential. We've used other brands, but none come even close to providing the level of filtering that these do. And buying these on Amazon has provided us a great savings.

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Customer Rating: - great help
Brita On Tap Replacement Filter, 1-Pack
Great way to use tap water for drinking and cooking. Helps to free you from using water in plastic bottles and is a whole lot cheaper.