There are cards out there that are much faster, with more memory, but this one is still reliable for certain applications.
357073
This was a really solid memory card when it first came out in 2007, with plenty of space available for most digital cameras at the time.  This card was never great for quickly transferring data to computers and discs (it's a Class 4).  However, time has marched on, and the card is no longer adequate in terms of size or speed for most uses.  However, there are some niche applications where you might be happy with its performance.  It works well in older digital cameras, but probably the best use of it is for digital picture frames and Raspberry Pi devices.
119780
This is a great card for multitasking, but it's outdated now for video games. Granted, it's not that bad. If you don't mind some inconsistent frames, you can play most any game today on high or ultra, given the game's own stability architecture and compatibility with the processor. For example, this card does not agree with No Man's Sky. That's mainly the developer's fault, though. You can still run the game on high, but the frames are inconsistent. I can run GTA 5 on Ultra with 53-100 frames; granted, that's probably the most well optimized game ever made. Battlefield One runs well on Ultra, with some frame jumps and slowdown when there are a lot of particle effects on screen. I have a GTX 1060 6GB, and that should be enough to handle BF1, so the processor is certainly the bottleneck.

Don't let someone tell you the Intel i5 is better. This processor is way faster, (20%, from independent figures). The only tradeoff is it produces a lot of heat. I've been told the energy cost is too high, but 400 watts across my whole PC is far from a big energy drain. Temperatures with a nicely ventilated case and a standard Coolmax fan stabilize on high performance, not overclocked, just below the processor/MB's shutoff point at times. But I've had no problems with it, no damage or anything, even keeping the PC at those temps for hours on end. Just from my own precaution, I wouldn't let the processor get that hot unattended. We're talking in the neighborhood of 150-180 degrees Fahrenheit. It idles at between 80 and 100 degrees, which isn't bad.
896766
I bought two of these cards at the same time.  I've been using them for a good month now.  So far, I haven't had any problems.  The read and write time is the same as my Sony card that is rated the same speed.  I feel that you can get a lemon in every brand, so you should give them a try and see how they work for you.  For the price, its worth it.
276059
I have tested this card for speed and in terms of read it exceeds my USB 3.0 Card Reader, but as far as write it does not seem to approach the rating.  I use it in a Canon 5D MKIII.  That being said it is still the fastest card in my arsenal.  Impressive for an SD Card.
4379300
This Kingston card has been going strong for over 2 years now with pretty heavy use. It's not the fastest card in my bag but it just keeps working. I'd suggest Kingston memory cards as I have yet to have one fail, which is more than I can say for some of the other value brands...
2535277
This card was used in a Sony A6000.

In my personal experience, the advertised speeds are relatively accurate on both of these cards that I own which were bought half a year apart. The write speed is what really matters and they perform as advertised. They haven't given me any problem thus far.

One thing is that I wish it included a plastic sd card case.
2177832
I did a simple test of taking photos as fast as my camera could take them in "continuous" mode. The real benefit of a faster card is more pictures, IMO. For the same amount of time, and the same object being photographed, my Panasonic FZ60 took 25% more photos with this faster memory card.

I took off 1 star because I think this is still a little expensive for what it is. A "standard" card can cost half of this card, and I do think this card is nice, but maybe not that nice for twice the cost. Other than that, it does what it is supposed to do....take more pictures in less time.
3218866
It's an excellent card, with fast download speed resulting in longer delay of buffer while shooting RAW pictures.  However it's very large size is generally unnecessary for causal users, and is more in line for pro-sumer individuals and up with serious photography requirements.  I'm using this for the Canon 70D, which fills up quickly when shooting video, and therefore I use it for when I'm shooting more video than photos on long events.  Even for me the card is a bit overkill for photos, but it's the card I turn to when anything might happen on the trip.
2238755
Been a year and counting and this card has done me well. It isn't the best out there and you won't be able to play everything on super high specs, some games you can but not all, but it's pretty darn good.
3397294
No longer a cutting edge card, it still handles all of the gaming challenges I throw at it. As a frugal gamer, I usually am behind the curve on upgrading my gaming rig, but lets face it, most of the games you would play don't need more than 2GB of RAM, it is really the GPU clock speed you want and the GTX series from any manufacturer is a good bet. This thing give me a pretty good frame-rate using the Morrowind Graphics Overhaul and that mod is a beast. I am happy.
2854236
Samsung memory cards continue to perform both in terms of speed and reliability. My new preferred brand for memory cards.
833681
I bought this card from amazon for my Canon 7D. I wanted a card with a good capacity because the video mode of the 7D "eats" 330MB per minute of video at 1080p. I knew this card would not be as fast as the Sandisk Extreme or the Extreme PRO but the first time I downloaded the videos from the card, I had a pleasant surprise, the average read speed was about 38~39Mb/sec. Just remember that you will also need a fast card reader to enjoy the full potential of this card, I have the&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Sandisk-Extreme-FireWire-Reader/dp/B000I04WWY/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Sandisk Extreme FireWire Reader</a>&nbsp;and a PCI Express Firewire 800 adapter from SIIG&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/Dp-Firewire-800-Pcie/dp/B001EQCNMW/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Dp Firewire 800 Pcie</a>&nbsp;(BTW this card works great on Windows 7 x64).
2319096
This is a good card. When one port is used, it speeds up transfer to just under 4 times as fast. I've read that this is diminished when more ports are used the same time, but I haven't tested that. Still, I only use one at a time, so happy with the card.
4284751
very good speed on read and write for a 64G card for only $20.
sequential read/write 86/56.

-----------------------------------------------------------------------
CrystalDiskMark 5.1.2 x64 (C) 2007-2016 hiyohiyo
  Crystal Dew World : http://crystalmark.info/
-----------------------------------------------------------------------
* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes

  Sequential Read (Q= 32,T= 1) :  74.908 MB/s
  Sequential Write (Q= 32,T= 1) :  35.441 MB/s
  Random Read 4KiB (Q= 32,T= 1) :  8.207 MB/s [  2003.7 IOPS]
 Random Write 4KiB (Q= 32,T= 1) :  2.124 MB/s [  518.6 IOPS]
  Sequential Read (T= 1) :  86.620 MB/s
  Sequential Write (T= 1) :  56.212 MB/s
  Random Read 4KiB (Q= 1,T= 1) :  7.907 MB/s [  1930.4 IOPS]
  Random Write 4KiB (Q= 1,T= 1) :  1.869 MB/s [  456.3 IOPS]

  Test : 1024 MiB [D: 0.0% (0.0/59.6 GiB)] (x5)  [Interval=5 sec]
  Date : 2017/02/25 13:35:22
  OS : Windows 10  [10.0 Build 14393] (x64)
3952084
This fast SDxc card has no problem keeping up with my camera, even shooting ~10 frames per second still, or 4K video. This cost less than some 32 GB UHS 1 (not UHS3) cards at local stores.
Long-term reliability is unknown, but if the NAND memory wears out [it does have a finite number of cycles], I'll update this review.
2148831
Much better than the equivalent 32GB SONY card. Has faster read/write capabilities in spite of having no [1] on the card.
4735531
This card has been reliable in my sansa mp3 player.  I bought it to use in a rooted nook color, but found it wasn't reliably fast enough to use as a boot disk.  I swapped it with the 8gb class 6 sandisk card I had in my mp3 player which has worked better (but not perfectly) in the Nook.
This card is rated as a class 6, but subjectively seems slower than that.  It's been just fine in a music player.