Not sure what to say... it is a microSD card. It does exactly what it should without any problems. Fits in microSD devices perfectly, can be used with SD card adapter to be used with full SD card devices without any problems. Seems durable and well built.
Even came with a lime green phone charm dangle thingy to store the microSD card and can be attached to keyrings, mobile phones, etc. A bonus as I did not expect it to come with one and was not in the item description.
Speedwise, it is quite fast for a class 4 card. Random reading/writing is faster than my Class 6 Sandisk Extreme III 20mb/s editions. Sequential reads and writes are sufficient for most day to day usage.
Have not tested the water proof and magnet claims, nor would I want too.
Overall, for the cheap price, I was pleasantly surprised with its speed. Would not hesitate to recommend.
CrystalDiskMark v3 32bit results:
Sequential Read : 17.724 MB/s
Sequential Write : 7.301 MB/s
Random Read 512KB : 17.569 MB/s
Random Write 512KB : 1.838 MB/s
Random Read 4KB (QD=1) : 6.905 MB/s [ 1685.9 IOPS]
Random Write 4KB (QD=1) : 0.022 MB/s [ 5.3 IOPS]
Random Read 4KB (QD=32) : 8.079 MB/s [ 1972.4 IOPS]
Random Write 4KB (QD=32) : 0.021 MB/s [ 5.2 IOPS]