I had to take the device apart due to the gap not being big enough to fit a SSD with heatsink. Even with it apart it did it's job. Depending on the type of drive or the manufacturer of the drive, you may not get the max speed for transfers.
I have a Samsung 1TB 850 EVO SSD drive (almost 10 years old) and transfered 750 GB of different file types in a little over an hour at max speed of 525 MB/Second.
While my Western Digital 1TB (primary) SSD drive (7 years old), also had mixed files that were approximately 100gb together, would take over 2 hrs. I had one 60 GB folder take seconds, and other folder with the same size take almost an hour..
It really depends on the files and device you are transfering from/to.
The device doesn't allow your computer to register the type of SSD you are mounting to it, their is no communication so you can't really do adequate checks, or diagnostics on the drive.