Originally Posted by an3k
I was thinking about the Sandisk Extreme Plus 64 GB and Sandisk Ultra 128 GB but since I'm not using that much apps as I did on my 64 GB iPhone I decided to get the Extreme Plus also because of the huge difference in read/write speeds compared to the Ultra.
I didn't experienced any problems with the card. The only disadvantage is that I cannot use it in my tiny thumb drive since it only supports microSDHC but in fact I never needed it yet since Android supports MSC and with the tiny USB-microUSB cable that came with the SWR10 SmartBand everything is fine
There is Sandisk Ultra 128GB and Extreme 64GB and Extreme Plus 64GB. I believe the card reader on z2 should not support the Extreme Plus speed(80MB/s read & write) so you just need to get an Extreme 64GB(40MB/s read & write). The Ultra ver should be around 40MB/s read with only 10MB/s write.
Basically, the read speed on z2 on Ultra/Ext/ExtP is just about the same, the huge different is only at write speed. If budget isn't a concern and think about future upgrade like z3/z4 probably would support higher speed, you can just get the Extreme Plus.