Could you run Crystal disk mark on it?
Hmm, nope. That program seems to be Windows only and I couldn't get it to run under WINE. I'm not sure that the result from my current situation would be all that helpful anyways - It's EXT4 encrypted, 66% full, I think the link's SATAII, and the CPU is an old little 15W ULV thing. So I don't expect the numbers are too great in its current configuration.
If you were looking to compare with other items running Crystal Disk Mark, the right way would be to pull the drive, format the whole thing to FAT32, and put it in a SATA3 slot on some Windows machine with an i7. But I'm not willing to do that.
I could try running "iozone3" if you're interested, but I'm not sure how to get results that are comparable to the numbers crystal disk mark puts out.
I did do a test when I first installed it with gnome-disks, but I didn't save it. IIRC it was something like ~300 MiB/s read, ~150 MiB/s write, 0.1 - 0.01 ms access time, but that's going by memory. I do remember it looked like the speeds were bottlenecked by the laptop side, not the drive. All I really care about is write access time (~= 4k write performance), and it must have been good enough.
As for the brand, yeah I was a bit uneasy too, but it was the only 1 TB drive I could find on any website in the 2242 form factor at the time. I think I paid about $200 for it. If I was buying now (and feeling lucky), it looks like there are some cheaper KingSpec ones on ebay these days: https://www.ebay.com/itm/163662813633