Ironically, the original Samsung TecTiles do not work with the S4, but the TecTile 2's do.If you're worried about reliability then I'd check out the NFC Tags by Samsung. I've always felt that OEM is the way to go with anything but then again I'm paranoid. The only reason I break down and go aftermarket is when the OEM product isn't available or has a design inconvenience that I'm not a fan of.
Just getting into the idea of using NFC tags. I've heard there are ones not compatible for the S4.
Just curious as to what everyone recommends the best ones are. Performance and cost come into play. I'm only looking to have 5 or so