Let's face it, the form factor for this amount of storage is incredible. Sits tight and hardly sticks out. There are no problems with heating either. That said, it should be pretty obvious to even the most tech-savvy of us that given the form factor, it's hardly possible to deliver what's promised on the box (I can't exaggerate, this thing is tiny). Accordingly, copying over a few small files works well and with good speed. The writing speed drops sharply from a file size of 500 MB (<2.5 KB/s). Same behavior on Windows 10 or Ubuntu 18.4. Formatting in a different file system does not matter. In short, what a gimmick, it's great to expect reliable business use of it, or maybe not. I returned mine. Instead, I would recommend the slightly larger Samsung, which are fast and very reliable.
Kingston DataTraveler SE9 32GB USB 2.0 Flash Drive for Reliable Data Storage (DTSE9H/32GBZ)
69 Review
32GB SanDisk USB Flash Drive (SDCZ430-032G-A46)
78 Review
Sandisk Ultra Flair 128 GB Silver USB Flash Drive: Reliable and High-Speed Storage
65 Review
Samsung BAR Plus 128GB USB 3.1 Flash Drive - 400MB/s - Champagne Silver (MUF-128BE3/AM)
65 Review
2 TB External HDD Western Digital WD Elements Portable (WDBU), USB 3.0, black
84 Review
18 TB External HDD Western Digital WD Elements Desktop, USB 3.0, black
95 Review
Shock-Resistant Transcend StoreJet 25M3 USB 3.1 Slim Portable Hard Drive with 500GB Capacity
99 Review
π Seagate Backup Plus Slim STHN2000400 2TB Portable Hard Drive - Black: Your Reliable External Storage Solution
93 Review