I have an FFC version of that product and it works very well. Whatever data rate reduction I might see from the additional length is overtaken in a really big way by my ability to use full-size SD cards instead of the micro-SD card slots my development boards usually come with.

You definitely don't need a shielded cable. SD is very robust. Hell, I've seen people run SPI or I2C over similar lengths and types of cable and those two protocols are much less robust than SD.