Craig
Of late, Sandisk appears to have lost their way a little with their flash storage products. It's almost a universal truth that all of their USB flash drives are hopelessly slow; while they're usually reliable, transfer rates of 4MB/sec or less are worthless when filling a 32GB drive. Fortunately, their "Ultra" line of SD cards still appears to buck this trend.Formatted as NTFS and used in anelago Mobile Nano II reader, I see write speeds on a 64-bit Linux machine at a consistent 15-16MB/sec when copying large (1GB or larger) files to this card, which more than lives up to its class 10 billing. Reads appear to run at about 19-20MB/sec.I can't comment on reliability as I've only had the card a few days, but everything I've copied so far for testing has made it onto the card (and off again) with no corruption whatsoever; the MD5 checksum of every file I've transferred matches the source. That's more than can be said for the Supertalent Pico USB drive that this SD card and reader are intended to replace, which has never been quite right (it's always occasionally randomly corrupted files of larger than 100MB or so, and the probability of 1GB or greater files surviving was near zero).32GB appears to be the sweet spot at the moment; smaller cards don't cost that much less, and larger cards are beyond the SDHC spec and into SDXC territory, which isn't yet universal in terms of device compatibility (not to mention they cost far more than double for 64GB).For what I paid for this around Thanksgiving (not part of any explicit sale, but definitely a lower price than appears usual as far as camelcamelcamel is concerned) I'm extremely satisfied.Edit: I should also mention that the included mechanical full-size SD adaptor is one of the worst I've ever encountered. There's a lot of friction when the microSD card is inserted, and it's a right bugger to get it out of the adaptor again. Thankfully I have a few other such adaptors lying around should I ever need one; this one's going in the bin.