Best random read/write speeds ever.
584819
I purchased this to run NativeSD Android ROMS off it.  The superior random read/write performance for this class 4 card easily beat the class 10 kingston I had before.  Now booting into Android is easily 3 times faster than before, along with increased responsiveness as the NativeSD ROM accesses the microSD storage.
2517677
Access for both read and write at high speeds; perfect for backing-up entire HD's and moving large files between devices you don't want to expose to Wi-Fi.
1328011
Using Crystal DiskMark, I have personally measured this drive at 130mBps read and 79mBps on write on my system using USB 3 and with USB 2 I get 35mB/s read and 29 mBps write. To the people who complain that it retracts while you insert it, all you have to do is hold the slider while you insert. This is the same for all retractable USB drives and just takes a tiny amount of getting used to doing.  This seems no worse constructed than other drives (excepting perhaps some of the made-for-abuse models).

Trying to think of a negative, the ONLY thing I come up with is that it would be nice to have 1-2mm more clearance in the area for putting in a lanyard.
18854
I bought two of these. They are S-L-O-W. I get a write speed of about 10 MB/s. I have older USB 2.0 flash drives that are 3x as fast.
4842843
High speed continuous read and write, great for high speed storage use. Relatively low random read/write compare to M4, so I`ll just keep my M4 as system partition
2381721
Using SanDisk Extreme Pro 64 Gig.

http://www.amazon.com/SanDisk-Extreme-Memory-Speeds-Ready-SDSDQXP-064G-G46A/dp/B00NUB3530?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o09_s00

Getting consistent read speeds in the mid 90's and write speeds of 70 MBs.
3803311
Simple. Fast (seen 70MB/s quite a bit). Cheap.

Not much more you can ask for.

Only thing I recommend is formatting it to exFAT vs FAT. No idea how it came formatted in FAT, but it limits you to a sub-4GB file. Other than that, it's fantastic.
4378085
I have this in conjunction with an SSD as I need fast writes for some applications and its also much cheaper per GB. Much faster than a standard drive in both speed and seek time.
4497487
Super duper fast transfer speeds. Loving it.
2555617
Insanely fast for my hackintosh build.  Highly recommended.
3882972
It fails behind SanDisk Extreme HD Video - 16 GB - Class 6 - 133x card and quite noticeably. During tests it was struggling with 4 MB/s by testing with multiple small bursts. If you put a constant load then you can expect up to 14 MB/s writing performance and anywhere in the range 15-22 MB/s of reading performance. Despite this sluggishness it offers lots of quite fast and good for a buck space. Tested both on PC and CANON 60D. I should add that SanDisk was especially quicker in multiple small burst test (varied 6-12 MB/s in writing).
1755178
Works perfectly with Crucial/Micron M500 960GB. Getting about 450MBps read, and write speed is similar. Backs up 200GB of 1MB-100MB files in about an hour.
4779328
VERY fast for a thumb drive! It matches advertised speeds for me and reads/writes faster than all of my HDDs. Only my solid-state drives can keep up with it!
2429116
Easy to install, works great. Excellent addition to my W540.
Read speeds are excellent ( ~495MB/s), while write speeds are ok - (180MB/s, probably my laptop, not the drive).
1585730
I just got this SSD and coming from a 500gb western digital all i have to say is wow. Games, OS and everything just loads right up, no waiting anymore. its amazing! i did a benchmark and i was getting 520mb/s write and 506mb/s read! which i thought was weird since write was always faster than read in all my benches. BUT who cares! 500mb/s whos gonna notice the difference?!?! i don't think ill ever go back to hard drives except for movies and music and stuff. Love this drive and i recommend it to anyone looking to speed up your system! i got the 120GB and i still have 50gb after games and some programs installed. LOVE IT!
2594707
This thing is incredible. I use it as a standalone CF reader (CFR1) it's blazing fast to transfer huge amounts of data. I am consistently off loading tons of images in raw format at 22-30mb each, so after each shoot I am transferring about 50-60gb per card into my computer.  I don't have the fastest cards some at 160mbs and 240mbs but i can off load entire cards in several minutes.

Before I used this, I used a reliable standard multi card reader from Sony. It worked, never failed, Then i started upgrade my gear to have 3.0 readers,  I thought it was fast under 2.0 back in the day. But holy.... 3.0 is another world.
1211733
getting read speeds of 1225MB!
Perfect for after effects. my writes are only 475MB but that is only because I bought cheap SSD's. If you get something like 4-250gb EVO drives you could easily get 1200+/1200+ read/writespeeds. (In raid 0 of course I do not recommend RAID 0 for anything but Media Cache Drive or similar.)

in RAID 10 you will get about half those speeds with some added security.