Bests & Worsts Reviews from Amazon

When I first tested this product (Transcend Information 32 GB High Speed 10 UHS Flash Memory Card TS32GSDU1) around end of last year, I was quite happy with the results. According to CrystalDiskMark v3.01, the card delivered a Sequential Read speed of 20MB/s and Write speed of 19MB/s. This means it far exceeded the minimum speed requirement for a 'class-10' card, which is just 10MB/s in Write. On the other hand, those number are no where close to the '300x' printed on the card, which implies 45MB/s. I suspect that the card reader I used (Transcend M5) was limiting the speed of this card. So recently I re-tested this card using the Transcend USB 3.0 Card Reader (TS-RDF5K). I was delighted to see dramatic increases in both Read and Write speeds: - Sequential Read speed increased from 20.0MB/s to 34.8MB/s (+74%) - Sequential Write speed increased from 19.0MB/s to 29.0MB/s (+53%) One important point to note: I did my benchmark with the RDF5 card reader plugged in to an USB 2.0 port. The theoretical speed limit for USB 2.0 port is 60MB/s, but in practice the most you can get is around 60%, or 36MB/s. So the maximum speed of my Transcend card is still being limited by the USB 2.0 port. I expect both the Read and Write speeds to be even higher if I can conduct my benchmark from an USB 3.0 port. Just for comparison: - My old Transcend TS16GSDHC10E says 'class-10' but not 'UHS'. It delivers 21.7MB/s in Read and 16.8MB/s in Write, under identical test conditions. - The SanDisk Ultra SDSDU-032G-U46 claims both 'UHS' and 'class-10'. Its Read speed maxed-out at 38.8MB/s, but its Write speed pales at just 12.7MB/s. (See the benchmark results of several SDHC cards I uploaded to 'Customer Images' section) Conclusion: This Transcend UHS card is one of my fastest SDHC cards, together with the HP CG790A-AZ Class 10 SDHC. The two cards are neck-and-neck in terms of Read/Write speeds. But currently the Transcend card is cheaper, which makes it a better value. By the way, I have used at least one dozen Transcend memory cards (including CF, SD and micro-SD) over the past decade, and have never encountered any card failures. So I have no questions about the reliability of Transcend products.