The SanDisk Ultra 64 GB is just a storage device, so I don't find that there will be many "features" to get excited about. That being said, it is advertised as having 30MB/s transfer speed, but this is misleading. It can READ up to 30 MB/s, however, and the packaging says this too; it writes at a slower rate. I used this for my phone (too much music) and had the stock 8 GB microSD that came with my phone. I had about 6.5 GB of data that I wanted to transfer back to my new microSD card, and this took about 30 minutes. If this were a strict transfer from my internal hard drive to an external it would be faster, but this is not such a connection. It lost a star because the transfer took so long, but in reality, I don't expect to be transferring 6 + GBs of data anytime soon so this problem will be minimal for me. Other than that it works great, and I have not had any issues with the formatting or reading.