Product review (5 stars): This is my SECOND purchase. Fit and work perfectly.
I bought a 2-pack 2 years ago, and I have reordered a second pair. I change them just annually as there are only two residents in my household.
They fit perfectly and appear to work perfectly, and the packaging looks trustworthy, but who can know how well they filter without a water laboratory? You gotta trust.

I noticed this manufacturer has another model that I believe is compatible with DA29-00003g, whereas this model, RFC0200A, is apparently compatible with DA29-00003a and b. I believe the ...g model may conform to a slightly tighter certification standard, and is newer than the original specification for my refrigerator, Samsung RSG257AAxxx.

I noticed some low reviews for fit on this page; I suspect that those complaints were from folks who did not push hard enough when attempting to reinstall their new filter. You must push in and turn simultaneously and go a full 90 degrees, i.e. 1/4 turn i.e. 1/4 rotation.