Ok I just got my sandisk extreme micro sd card in the mail today, formatted it with the device and did a benchmark. I'm getting around 20 MB/s + or - 5 or less on read and write speeds (I would have included a screenshot but after the first test my read speeds went upwards to 700 MB\s so I'm not considering them accurate.) I'm using a1 sd bench. So I think we should see what cards have the best read and write speeds. I'll try and keep the top three listed below. I'd love for someone who has the extreme pro to see what their read and write speeds are. Also the samsung brand. Is there a better benchmark app for sd cards?
SanDisk extreme micro sd
20MB/s read and write
SanDisk extreme micro sd
20MB/s read and write
