Box

I used it and introduced it to my research group when I was in grad school few years back. We also ended up getting a larger size account to fit our needs. University purchasing handled the financial side of it, but I'd like to think our recommendations for enteprise scale buys were taken heed.
BoxSync when used in conjuction with a box account does a great job of doing automatic backups on the cloud, that also help in access from different computers/collaborators simple.
It can handle large file sizes (5 GB file upload limit) for most work, has excellent integration with word processing for online document editing. Note, I have not tried very large single file uploads yet, the largest has been a movie file of 750 MB.
Recently they added notes feature which is useful for commenting while sharing files.
Mostly it is a very stable and secure cloud backup tool, great for workflow and content management in groups.

I dont know if they ever had a referral program unlike dropbox. No other major drawbacks as a user. By default, it sends a lot of emails whenever anything is changed in the folders. turning off that feature took a while to figure out for me.

They concentrated on the enterprise first, which is valid. Therefore security has always been tight, platform support is solid, and enterprise administration is very robust. Shared folders are great in a workplace and make everything very simple to get the right docs to the right people when they need them. Box is definitely an enterprise company, with the support to back up that claim.

I should start by saying I tried Box, Dropbox, and Drive head-to-head back when everyone was going to cloud-storage and my experience with Box since then has been on and off. I'm still a current user of Drive and Dropbox and I pay for both every month. Our office doesn't need the level of admin support Box provides, which is the only feature that puts it ahead of the competition.

Box was just never as feature complete as Dropbox, I don't want a separate cloud storage provider for business and for home use and Box lacked simple tools like automatic photo upload. As well, the web interface lacks and the uploads feel slower and more prone to error when compared to Dropbox. It's improved lately but it's still behind in file viewing support, etc.

Also paid users have a max file size!!! Unacceptable if you do any sort of video/graphics work.

Uploads and downloads are fast, sharing files or folders is easy, as an editor or viewer, and it is easy to use.

The Business options are expensive for small businesses since they require you to purchase multiple licenses, not only one. If you get the Individual license you are not GDPR compliant, thus it turns out to be expensive for SMEs.