These stealth frigates/corvettes are way too small to have any serious range or sea-keeping abilities. These are pure coastal defense vessels that are going to use their "stealth" design to hide in the radar/acoustic clutter of their own coastline. Of course this does nothing when it comes to space surveillance and little against AWAC's.
You don't see the USN breaking it's neck to jump on the bandwagon.
That's true of the Swedish design, but how much range/seakeeping do you need for the Baltic anyway?
But the South African Ships are just the latest version on the Meko-200 Frigate used by everybody. 3500 tons, range that matches an Arlegh Burke destroyer and the RAN/RNZN Anzacs seem to be coping with Southerm Ocean conditions.
You don't see the USN breaking it's neck to jump on the bandwagon.
Ah-hem. Littoral Combat Ship (LCS)