Your mileage may vary but so far I’ve had no trouble with a couple class-10 cards in cameras, that see daily moving when a camera has been used. They’re a 32gb SD in a DSLR and a 16gb microSD in a Hero3. The micro is newish but is has been in and out of the camera a few dozen times now. The SD has been in and out of that camera a few hundred times.
I suppose it varies per brand and model how reliable they are. And how well they get treated on the move.
When I’m traveling they each get pulled from their camera, uploaded into a wolverine, uploaded into a tablet, then back into the camera and cleared daily on my routine.
(the hdmi out of the tablet can often find a connection on hotel tvs, and we can browse at the end of the day through unedited heaps of pictures and uncut snorkeling movies – “Hey, there goes that conch!” – while a nice tropical drinkie sinks in).
The microSD type seems inherently fragile, there’s just so little to them, like handling part of a potato chip as big as the fingernail on your pinkie.
It would not be hard to overpush a microSD if it’s not going into the socket with the correct side up. Or torque it when taking it in or out enough to break connections.