Originally posted by crewl1 I disagree with this advice.
SanDisk may be more expensive but when on sale they are a good value, and why put cheap cards in your fine Pentax machine?
The K-5 slot works just fine with SanDisk.
Using a microSD card just adds one more free connection point via the adapter that could fail. I guess this is OK if you are not going to be inserting and re inserting the card.
The K-3 slot is very fast, if you are going to do high fps shooting you should use the fastest card you can afford.
SanDisk cards are rarely on sale, at least where I live. I did manage to get an affordable microSD SanDisk that has the same rating as my microSD Samsung, but despite being UHS-1 it seems like in my K-5 the Samsung is actually faster.
There is nothing mechanical about a microSD card that can break. SD card, yes, plenty of stuff, but a microSD card is extremely solid. It's a PCB with some contacts. So at most the adapter will fail.
I wouldn't say that Kingston is low quality, but 2 died. I forgot my Transcend cards, where 2 more died. And again, it also happened with a SanDisk card! It's usually some plastic part around the golden contacts that fails, or the lock switch, and microSD cards have neither. So I'd say if you never remove a SD card, it's ok to use SD. But if you take it out frequently, as I do, then forget about it.