Product review (5 stars): Perfect replacement.
Despite the fact that the very first review I looked at was bad, I decided to give this a try. Especially considering 1400 other reviewer's praised it.

Never having replaced it before, I took two seconds to read the directions. It was incredibly easy. I have better water flow than before. I'll never buy The namebrand cartridge again at twice the price of this.

I'm pretty sure that that bad review or somehow managed to install it improperly.