To start off with if you are expecting to get WRITE speeds of 100 mb/s forget it, a card like this would be much higher in price. However i knew beforehand this would not get these WRITE speeds but i was hoping i could get the 100mb/s read speeds but i did not.
I only tried it on my desktop using a usb.3.0 card reader ( from trascend) Write speeds were 23.5 mb/s read speeds were 32.0 mb/s
For reference it took 2 hrs and 13 min to fill up the entire card with data, and 1 hr 37 min to read it. Using this on a phone ( samsung galaxy s5) it wasn't too different, the write speeds actually droped to 20 mb/s while the read speeds jumped a bit higher to about 40 mbs. Please note ''up to 100 mbs speeds'' means potentially not promised however i could not even get half of the potential speed.
Overall if you can get this card below $60 go for it ( i never thought id say this for a 200 gb micro sd card!) , otherwise if speed is important to you go with a faster card probably the sandisk ''extreme'' line which normally have a gold color ( but x3 times more expensive)
I am not entirely disappointing with the card, mine was for simple use but anything actually requiring the speed may want to hold off.
for those people that doesn't understand how hard drive and memory formatting work ill list the formated exfat size so you know the actual size formatted : 183GB