Product review (4 stars): OEM Samsung Filter
Same filter you can buy in the local big box store (both Lowes and now, Home Depot carry it) but at a decent savings. Does exactly what it needs to do and does it for about 6 months so it's nice to only be replacing this twice a year.

If at all possible, do precisely what the instructions say -- turn off the water supply before replacing the filter. You can swap filters without doing so but, in my experience, the water system in our Samsung fridge has been its achilles heel. These filters are a bear to get locked properly in their housings compared to other filters on other refrigerators I've had. But if you've got one of the high-end Samsung fridges, you've got to have it so this is as good a place as any to get it.

Nice to be able to save a few bucks by planning ahead a little and not having to run down to the local store!