When we tried to upload word documents (or pdf with the same content as that word document), the display for a recipient was not really great and we did not want to allow them to be downloaded. The interface for the recipient should be such that it appears full screen, so the font size (12) used is actually readable. Because of that we had to use Google docs with the right sharing settings which is horrendous given what we paid for DocSend to use it.
Honestly, for companies Seed rounds, the need isn't that massive and the price could be a bit of a turn-off as well.
The connexion to Google drive, was not super straightforward to us and we were actually willing to use that initially to keep it easier to update certain documents
The presentation feature is not great, I usually download and go on powerpoint because the interface does not appear as it should be on screeshare. Review collected by and hosted on G2.com.