Like anyone else, I bought these cartridges because buying the original branded version is so expensive -- in fact so expensive that it makes the environmental crime of binning a good printer and buying a new one with full cartridges a tempting alternative.
Fitting and installation was easy, the printer recognized the cartridges straight away and a test page popped out by itself as it should. There's no difference in print quality that I can discern compared to the Samsung brand. The cartridges I received came with best before dates of 18 months to two years, and some had a 'use after installation' date of 6 months; I don't know whether to take this seriously, as it may only be to satisfy legislation or protect the supplier with a limited warranty. So far I have no reason to expect performance different from that of the Samsung brand.
So, as far as I'm concerned, I have the same performance at a much, much lower price, and feel I can recommend these cartridges as the sensible alternative. I'll update this review if I have any reason to change that opinion! Meanwhile, I think you can buy with confidence and be glad of the saving. Shipping was fast and the products well packed.
UPDATE over one year later: printer has been in storage a few months as I use it in a holiday place, out of box and printing again -- works fine! One tip: printer was loathe to get going, tried to start but couldn't quite do it, nothing to do with the toner: I pulled out the whole block containing the cartridges, and by touching the side of the blue roller, not the surface, I rotated it just a fraction -- couple of millimetres is enough. Everything now fine.