"I heard" and a link to a site with reviews are different approaches to making a decision about the quality of a component.
I just googled "Transcend microsd card reviews" and found one negative among dozens of positive reviews. I am sure there are more negative reviews to be found, as this is true of any device or component of a device purchased.
However that brand of microsd cards is in every single piece of memory-borne equipment we use at our facility, including over 600 monitoring devices and nearly two thousand special paging units; never a glitch, memory loss or degradation of data in years of duty.