My MacBook Pro Mid 2015 has SSD. That is very fast and helps me to be productie. Back in the day 🙄 this kind of storage was expensive so I limited it to 256 Gb. With my Photos, Music and Downloads that space was filling up fast. Here is where the Transcend Jetdrive comes in. Specsheet on transcend-info.com
Note: my MacBook has a SD card slot.
I bought the 256 Gb Transcend Jetdrive in October 2018 after some months of internet searching for experiences, youtube watching and reading customer reviews on webshops. This memory card would hold my precious files and it must be solid (no pun intended) Prices have dropped since 2018. I paid €150. Still one of the best purchases I’ve made.
Photos
After installation I moved my Photos library by following the support article on apple.com. The deletion of the old library was scary. All photos are synced with the iCloud photos option with originals downloaded to my MacBook. Backup was in place.
Since the location of the photos library changed the ‘upload’ started again. On apple’s discussion forum it is explained as normal. Just had to wait a day for all checksums to be validated.
Music
Now my music library has to be moved. Again on apple discussion someone has the answer to my questions. Moved the library, opened iTunes (old version of Music) with option key pressed and selected the new music library. Last month downloaded my complete library from iTunes Match because I want a backup of the license free files.
Downloads
Last step was to move my downloads and the default download location. Now a stackexchange thread has the answer.
Conclusion
The end result is a lot of free space on the fast SSD and a backup of all my slow files on the Jetdrive.
No problems after more than a year of usage. Highly recommended!
.NET Development by Eric 
Hey man, it’s November 2020 now. Still all good? Is the photo library working OK from the flash drive?
working good – no problems
JetDrive explicitly says not to put Mac Photos app on the JetDrive Lite. I did it before knowing this and then had problems. Luckily, was able to move it off, rebuild it and it’s working again. But I realized that I should have reformatted the Jetdrive to Mac Journaled first which is not made explicit anywhere… Was hoping that this would cure whatever had happened, but just found the warning not to put Photos on Jetdrive. https://www.transcend-info.com/Support/FAQ-950 Anyone have more thoughts or user experience with this?
Sorry to hear you’ve had problems. The page you link to advises to use HFS+ file format when you store the photo library on the JetDrive Lite.
For me this is still working without problems.