I can't speak to their performance because they seem to be all one brand (and not a major one like SanDisk) but they ARE out there.
Only a matter of time before that territory is breached by the major player though. Nintendo themselves even have a branded 1 TB SD card (made by SanDisk ofc).
Every good Ferengi deserves a good female who's willing to cut and chew his food for him. I'm such a sucker for romance