Product review (5 stars): Great customer service, great tasting water!
I purchased this Made in the USA filter for my nice new expensive Samsung fridge as the filter that came with it made the decent tasting tap water taste like plastic no matter how many gallons I ran through it.  Enter this filter.  I followed instructions.  It fits where the old filter fit.  However, the seal (or lack thereof) is absolute rubbish.  Turned water back on and water gushed out all over the floor.  Got mess cleaned up with a couple rolls of paper towels and pulled filter and examined the ring.  It was loose, evidently providing for something other than a watertight seal.  I looked at the old Samsung filter- it was nice and snug, as such a ring should be... in order to create a water-tight seal.  I just want a filter that fits and doesn't make my water taste like plastic or pour water everywhere out of a fridge that was over a thousand dollars!  Is that too much to ask?  Evidently so!

I hope they honor their 90 day unconditional money back guarantee.  I will follow up.

Follow-up. 18 Oct 2012  The company that makes these wrote me back and said unfortunately it's a new product and a shipment of the filters went out before the problem was corrected.  They are sending a new filter to me today.  I added a star for their fast and responsive customer service.  After the new filter gets here and installed, I'll update the review again.  Hopefully they recall the filters from the distributors before anyone else winds up soaked. (if you'll pardon the pun).

Follow-up 30 Oct 2012  I forgot I had an additional filter on order with Amazon (as they were out of stock when I initially ordered from another seller).  I figured when it shipped, I'd have a back-up.  It arrived before the replacement and it too had a loose o-ring.  I was hesitant to install it given that fact, so wrote the company.  They were surprised to hear I got not 1, but 2 messed up filters.  At that point I was ready to give up- but true to their word, the new filter arrived, and they sent me a spare o-ring.  I haven't opened the new one yet, as I popped a snug o-ring on the filter.  The water is great, and doesn't taste like plastic.

Because of the great customer service, the refreshing non-plastic flavored water, some faith in humanity has been restored, and thus they are getting a full 5 stars.  Granted, they should have caught this before they shipped, and recalled them so no more faulty products went out, but we're only human, and they worked hard to fix the problem- and now that it's right, I want them, a US business, to stick around selling more affordable and higher quality filters!  I do not ever want to go back to a foreign plastic-tasting-water filter.