We always built 1Password for ourselves. It is so much easier to develop a product that you use yourself every day.
I haven't used the standalone version of 1Password for over 5 years now. The same is true for pretty much everyone working at 1Password.
Why? Because the service is much much better and more than just simple syncing of data:
- Account recovery for family and business team members
- Easy sharing of passwords and documents
- Vault permissions
- Item history/automatic backups
- Free family accounts for businesses
- Travel mode
None of these features are possible without a server doing its part.
Roustem Founder of 1Password