It is the most appropriate tool to quickly share documents with someone you don't want to give access to your company's own online library, yet you have to share files. It's great that there's no need to create a user, nor for uploading or downloading files. Just have in mind that the documents on the link have an expiration day!
Some access settings are mutually exclusive for performance (REST vs. CIFS)
QoS by Tenant requires use of external ADC (Hitachi suggested and sold us Pulse Secure) and their support on this product offering is not up to their normally high standard
With the free version, you are limited to 2GB of file transferring. Likely if you are sending lots of files, you'll be upgrading to Plus instead.
Download links expire after a certain amount of time. It's important to download each link immediately and not forget where you left the downloaded files.
I am generally very satisfied with the service. The free version alone takes care of 90% of my needs. The same holds for a lot of other people. It's a very smart business model as it gained mass market appeal (e.g. personal use) and thereby carries a lot of trust. I also never had issues using it.
WeTransfer is extremely reliable 99% of the time. There has been twice in 4 years that their service was unavailable due to server outage for several hours.
I've only reached out to WeTransfer support once, but they were prompt, courteous, and answered my question. I assume that future interactions would be the same, I'm looking forward to being a long term customer.
While Dropbox does offer features that WeTransfer does not in terms of collaboration & organization, WeTransfer is the better option for simple file transfers. In my experience, WeTransfer is much faster for uploads & downloads. The premium version of WeTransfer also offers a lot of customization options that Dropbox does not.
When we've had our BETA testing programs for our products, we always used WeTransfer to send our BETA version of our products. Doing this using WeTransfer was free and we also didn't have to worry about unauthorized people later down the road downloading these versions as WeTransfer deletes the files after a small number of days.