Product review (3 stars): Took too long to clear the air...
They work fine and cost considerably less than that from Sears.  Only issue I had was that the first filter would never work properly because of trapped air inside.  Therefore, I soaked the next filter overnight and had to shake it underwater for an hour to get all small bubbles removed.  The second one works very well now.  i froze the first one and will try it again in 6 months.