Pros: Wanted to increase my phone's memory a bit to store more pictures, music, videos, etc. Found this MicroSD card at a very reasonable price.

Cons: Bought this MicroSD card in August 2015 and it was dead by December. Would not store anything. Tried installing it on different devices (phones, laptop, etc.) to ensure that it wasn't the device and not the memory card, but encountered the same problem with all devices. Even tried formatting the card several times but it would fail every time. I found a bunch of other brands that were less expensive but decided to go with Samsung because it is a proven brand and would expect better quality, but I was totally wrong. This product is definitely not worth the money/trouble. Do yourself a favor, do not buy this product.

Pros: They are fast and reliable. Have had no issues with them in 9 months so far & don't expect to have any

Cons: None

Pros: This card works in Raspbery pi 2
Supports TRIM or discard

Cons: none

Other Thoughts: will buy more

Pros: good speed, while it lasts

Cons: bought 10-30-15 and died 1-29-16 Used in a Samsung S4 phone, nothing stressful, lost all my photos.

Other Thoughts: Phone and computer was not able to reformat the card and the card was unrecognizable.

Pros: Size and speed were solid.

Cons: Purchased 9/20/2015. Died 1/28/2016. Normal use conditions, no abnormal heat or cold. Used in android phone until it died.

Pros: None. Worked for about 40 days.

Cons: Terrible product, does not last at all. Had two of these cards... both being used for additional mobile phone storage. Both phones were Samsung brand, too. Two different phones... note 4 and s5. Within a month and a half, both cards had failed, corrupting data, and causing me to lose irreplaceable photos.

Customer service is absolutely awful as well... very unresponsive and performing spinal nerve surgery is easier than the RMA process.

Other Thoughts: Awful, cannot stress that enough.

Pros: I mostly use this card for raspberry pi and this card blows everything I had before out of the water.

Writing raw disk images from computer to the card at speed 18MB/s
At Random reads, Raspberry Pi 2 B boots significantly faster then on previous Class 10 no-name cards. I think I have previously wrongly attributed the slowness of Raspberry Pis to the CPU rather than inappropriate memory cards I have used before.

Cons: None so far.

Pros: Will work for a short while

Cons: Failed in one week on a Samsung phone! I thought buying a Samsung branded sdcard was the safest bet. Nope lost all data. Not recoverable with the best recovery software. The safest bet is to buy a card that has nothing but good reviews on the reliability. There will always be folks complaining about speed, trust me reliability is the only important thing.

Pros: works fast

Cons: crapped out on me just after a week and a half

Pros: Very Fast. Great price for a microsd card. I currently have it installed in my Microsoft Lumia 640. No problems so far. Anything made my Samsung or SanDisk. In the Microsd market is usually going to be very dependable and durable

Cons: None so Far.

Other Thoughts: Great Price!!!