With my SanDisk Extreme 60MB / s to reach a full 50 MB / s read speed in AS-SSD benchmark. I'm pretty sure that this is the limit of the card, a faster I have not to test.
The cable with 60cm including connectors have an average length -. I'm concerned it could be quiet for shorter notebook and camera bag, then it would be even more compact. However, it is a standard USB 3.0 cable with micro B connector, you can therefore also conveniently get another cable for it.