USB-C-ready, no security feature
The Tuff supports USB 3.1 Gen 2 (10Gbps) and has a USB-C port allowing it to work with all new computers that have USB-C or Thunderbolt 3. If you have an older computer that just has regular USB-A ports you can use the Tuff, too, since it includes a USB-C to USB-A cable. It also work even with a USB 2.0 port, albeit at much slower speed.
Out of the box, the drive is preformatted for Mac. If you want to use it with a Windows computer, you will first need to reformat it into NTFS, which takes just a few seconds. Or you can format it using exFAT if you want to use it with both platforms interchangeably.
The Tuff doesn't feature encryption, which is a bit disappointing. You don't have the option to shield the data it contains from prying eyes in case of loss or theft.
I tested both the SSD and HDD versions of the drive and they were fast. The SSD version was in fact the fastest among all single-volume portable drive I've reviewed, with sustained copy speed of some 460 megabytes per second. The HDD-based version, as expected, was slower at 140MBps, but still quite fast.
Should I get it
The CalDigit Tuff is a niche drive. If you need a tough storage device, and only then, it's a great investment. But if you just want a fast drive and it doesn't matter if it's vulnerable to drops and water damage -- which is the case of the majority of storage and electronic devices -- you can find many alternatives that are cheaper while offering more storage space.