I used it for more than 4 months and found no issue with write speed and reading speed. it works charmly and i love it.
Finally worth for the cost i spent.

Easy To Set Up; Easy To Use; Fast; High Capacity; Portable; Reliable

Recently started using MemoryBits recommended by a family member.The services is superb as is the quality of the product. Price is excellent. I am informed by email confirmations through the order process, products always come very well packaged, and have had no problems thus far.

Very fast delivery...

Mounting/Visibility – Even though my phone (DROID Maxx) has OTG and I installed the Sandisk app BUT for some reason the drive would not mount it seemed. This is likely a ROM problem so I did not list it in CONS.

Portability – This is a very compact drive; It's not the most compact I've ever seen but it is small enough that it is as near as makes no difference; Versatility - Having both Micro and USB Standard-A ports makes this a very handy drive; Build - It is well built, not flimsy at all.

Compatibility – not all mobile devices have OTG capability Covers – The sliding covers do not cover the tips the they are easily pushed back making them not very protective Port Length – The ports are minimum length so if you have a case on your phone there is a good chance you will have to take it...

This card is excellent for expanding storage on your smartphone. Its transfer speeds are are very fast hence it wouldn't slow your phone down. Only down side is that it is a bit on the expensive side.

I bought this for my camera prior to going on vacation. We took almost 1,000 pictures and still had plenty of room left for many more. I highly recommend this product.

The SanDisk Ultra microSDXC 128GB memory card is a great option for consumers looking to maximize the storage capabilities of their Android or Windows phone or camera without having to compromise by juggling multiple cards or storage platforms.

Industry leading capacity point; Ten year warranty; Excellent build

Slower transfer speeds than most microSD memory cards

Wonderful deal in great price! Data transfer rate is very high. Indeed, a great product by Sandisk!

not what I thought it was going to be but for the price not bad. works great but don't use it much anymore cause I really only use the 64GB microusb and that is like bare because I have a 2tb naz with a VPN sooo yeah. good product.

Great product works excellent with my GoPro Hero 3 plus!

Easy To Use; Great Value; Large Capacity; Reliable Performance; Writes/Reads fast