It reaches read speed of about 24MB/s and write speed of about 18MB/s at optimal situation.Other than the speed, everything is fine. I'd like to say the color is quite a good thing, because MicroSD could be so small that you put it away for a few seconds it will easily disappear. With the bright read and light grey color, it is much easier to find, because it will not blend into common background.Also, the quality looks good, not like some of the MicroSD cards, this is a "unibody" design that you cannot tell from appearance that where is the circuits. The SD card adapter come with it is in quite good quality too.In summery, good design, good quality, not too satisfying speed. It will be a judgement call to say if it worth it or not. But to me I can totally go with it.